Physics - Ray Optics Optical Instruments - Quiz-8

The minimum distance between a real object and screen such that a convex lens of focal length 20 cm can produce a real image on the screen is

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20 cm
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40 cm
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80 cm
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60 cm

A, B, and C are three optical media of respective critical angles $i_{A}, i_{B} and i_{C}$ . Total internal reflection of light can occur from A to B and also from B to C but not from C to A, then the correct relation between critical angles is

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$i_{A} < i_{B} < i_{C}$
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$i_{A} > i_{B} > i_{C}$
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$i_{A} = i_{B} = i_{C}$
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$i_{C} > i_{A} > i_{B}$

The angle of prism for which there is no emergent ray will be( $i_{c}$ = critical angle)

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$2 i_{c}$
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$> i_{c}$
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$< i_{c}$
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$> 2 i_{c}$

An optical element is shown in the figure. Radii of two surfaces are 10 cm and 20 cm. Calculate distance between two spherical surfaces so that image of the object coincides with the object itself

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100 cm
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80 cm
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110 cm
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95 cm

An object and a screen are fixed at a distance d apart. When a lens of focal length f is moved between the object and screen, sharp images of the object are formed on the screen for two positions of the lens. The Magnification produced at these two positions are $M_{1} and M_{2}$

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1 $M_{1} = M_{2} = 1$
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2. d > 4f
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3. $M_{1} = \frac{1}{M_{2}}$
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4. Both (2)& (3) are correct

An object O is placed on one side of two glass slabs A and B of thickness 1.5 cm and refractive index 1.5 cm. The position of the image of O, when viewed from the other side of slab B, will be:

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1 cm away from slab A
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1.5 cm away from slab A
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2 cm away from slab A
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2.5 cm away from slab A

A virtual image of an object is formed by a concave lens. The lens is then coupled (kept in contact) with a convex lens. A virtual image is again formed. Then the image, now

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Shifts away from lens system
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Shifts towards lens system
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Remains at its original position
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Data are insufficient to predict whether it will shift towards or away from the lens system.

The correct statement is :

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The intermediate image in a compound microscope is real, erect and magnified
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Intermediate image in a compound microscope is real, inverted, but diminished
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Intermediate image in a compound microscope is virtual, erect and magnified
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Intermediate image in a compound microscope is real, inverted and magnified

A compound microscope has two convex has a system with focal lengths 2 cm and 5 cm. An object is 2.5 cm away from the objective lens. The tube length of the microscope when magnification is maximum is equal to

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18.2cm
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14.2 cm
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8.2 cm
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4.2 cm

A particle is thrown at an angle $α = \sin^{- 1} (\frac{3}{5})$ in the air as shown in the figure. The angle received from the inside water is $(μ_{w a t e r} = \frac{4}{3})$ .

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$15 °$
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$45 °$
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$30 °$
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$60 °$

A convex mirror of focal length f forms an image, which is $(\frac{1}{n})$ times the length of the object. The distance of the object from the mirror is

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(n - 1)f
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$(\frac{n - 1}{n})$ f
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$(\frac{n + 1}{n})$ f
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(n + 1)f

We combined a convex lens of focal length $f_{1}$ with a concave lens of focal length $f_{2}$ and their combined focal length is F. The combination of these lenses will behave like a concave lens, if

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$f_{1}$ > $f_{2}$
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$f_{1}$ < $f_{2}$
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$f_{1}$ = $f_{2}$
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$f_{1} \leq$ $f_{2}$

A ray of light is incident grazing on an equilateral prism of refractive Index = 2. The angle of emergence is

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$30 °$
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$60 °$
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$75 °$
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$90 °$

A ray of light is incident on an equilateral glass prism placed on a horizontal table as shown. For minimum deviation, a true statement is:

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PQ is horizontal
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QR is horizontal
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RS is horizontal
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Either PQ or RS is horizontal

Assertion (A): A convex lens made up of glass can never form a virtual, erect, and diminished image.

Reason (R): Convex lens can give only a virtual enlarged image when an object is placed between the focus and pole of the mirror.

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Both Assertion and Reason are true and the reason is the correct explanation of the assertion.
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Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.
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Assertion is a true statement but Reason is false.
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Both Assertion and Reason are false statements.

The length of a compound microscope is 14 cm. The magnifying power for a relaxed eye is 25. If the focal length of the eye lens is 5 cm, then the object distance for the objective lens will be

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1.8 cm
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1.5 cm
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2.1 cm
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2.4 cm

Assertion: When a convex mirror is immersed in water, its focal length increases.

Reason: The focal length of a mirror is inversely proportional to the refractive index of the medium.

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Both Assertion and Reason are true and the reason is the correct explanation of the assertion.
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Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.
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Assertion is a true statement but Reason is false.
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Both Assertion and Reason are false statements.

A point source of light is emitting light in a vertically upward direction and the container is filled with a liquid of refractive index $\sqrt{2}$ . If it starts accelerating along the x-axis with acceleration $a = \frac{g}{\sqrt{3}}$ , the light coming out of liquid os deviated by

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$5 °$
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$10 °$
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$15 °$
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$20 °$

The minimum magnifying power of a telescope is M. If the focal length of its eye lens is halved, then the magnifying power will become

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$\frac{M}{2}$
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2M
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3M
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4M

Assertion: A beam of white light passing through a thin hollow prism does not give spectrum.

Reason: The speed of light inside and outside the prism is same.

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Both Assertion and Reason are true and the reason is the correct explanation of teh assertion.
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Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.
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Assertion is true statement but Reason is false.
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Both Assertion and Reason are false statements.

Assertion: When white light incident on a prism it will disperse.

Reason: The refractive index of a medium depends on the wavelength of light.

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Both Assertion and Reason are true and the reason is the correct explanation of the assertion.
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Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.
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Assertion is a true statement but Reason is false.
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Both Assertion and Reason are false statements.

A compound microscope has an objective lens with a focal length of 1.5cm and an eyepiece of focal length 5cm. It is focussed on an object which is at a distance of 1.8cm. The length of the microscope for normal adjustment is

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14cm
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4cm
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19cm
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9.5cm

An object of size 3.0 cm is placed 14 cm in front of a concave lens of focal length 21 cm. the image produced by the lens is:

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inverted and virtual.
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erect and real.
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erect and virtual.
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inverted and real.

When a ray of light falls on a given plate at an angle of incidence $60 °$ , the reflected and refracted rays are found to be normal to each other. The refractive index of the material of the plate is

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$\frac{\sqrt{3}}{2}$
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1.5
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1.732
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2

Assertion: The focal length of a convex mirror is always takes as positive.

Reason: A real image of a real object cannot be obtained with a convex mirror.

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Both Assertion and Reason are true and the reason is the correct explanation of the assertion.
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Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.
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Assertion is a true statement but Reason is false.
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Both Assertion and Reason are false statements.

A white beam of light can deviate without dispersion by

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using two suitable glass prisms placed in the same sense
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using two suitable glass prisms placed in the opposite sense
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Using a suitable glass prism
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None of these

Assertion: The nature of the image of an object depends on the size of the mirror.

Reason: It is not possible to obtain a real image by a plane mirror.

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Both Assertion and Reason are true and the reason is the correct explanation of the assertion.
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Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.
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Assertion is a true statement but Reason is false.
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Both Assertion and Reason are false statements.

If total deviation produced by two plane mirrors is $300 °$ then number of images formed of an object placed symmetrically is

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5
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11
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2
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7

Assertion: A convex lens may be diverging.

Reason: The nature of a lens depends upon the refractive index of the lens and that of the surrounding medium.

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Both Assertion and Reason are true and the reason is the correct explanation of the assertion.
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Both Assertion and Reason are true but the reason is not the correct explanation of the assertion.
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Assertion is a true statement but Reason is false.
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Both Assertion and Reason are false statements.

A man runs towards a stationary plane mirror with a velocity 15 m/s. The magnitude of the velocity of the man relative to his image is

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15 m/s
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30 m/s
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45 m/s
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Zero

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Practice Physics Quiz Questions and Answers

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Practice Physics Quiz Questions and Answers

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