CBSE Questions for Class 10 Physics Light Reflection And Refraction Quiz 8 - MCQExams.com

An object is placed somewhere in front of concave mirror. The focal length of the mirror is $$10.0 cm$$. The image for this object CANNOT be formed in which of the following locations?
  • $$25.0 cm$$ in front of the mirror
  • $$20.0 cm$$ in front of the mirror
  • $$15.0 cm$$ in front of the mirror
  • $$5.0 cm$$ in front of the mirror
  • $$10.0 cm$$ behind the mirror
Material $$1$$ has an index of refraction of $$1.15$$.
Material $$2$$ has an index of refraction of $$2.30$$.
If light passes from air into each of these materials at the same angle of incidence, how will the angle of refraction in material $$1$$ compare to the angle of refraction in material $$2$$?
  • The angle of refraction in material $$1$$ will be half as much as the angle of refraction in material $$2$$
  • The angle of refraction in material $$1$$ will be greater than  the angle of refraction in material $$2$$
  • The angle of refraction in material $$1$$ will be less than the angle of refraction in material $$2$$ but not necessarily half as much as the angle of refraction in material $$2$$
  • The angle of refraction in material $$1$$ will be less than the angle of refraction in material $$2$$ but not necessarily twice as much as the angle of refraction in material $$2$$
  • The angle of refraction in material $$1$$ will be one-fourth as much as the angle of refraction in material $$2$$
Above, a light ray is pictured entering a piece of glass from the air.
Which diagram most accurately shows the path the light that passes through the glass will take?
499139.jpg
Which of the following are the properties of plane mirror images?
  • The image is the same size as the object
  • The image is virtual
  • The image is laterally inverted
  • Image distance is equal to object distance
We want a mirror that will make an object look larger. What combination of image and object distances (from the mirror) will accomplish this?
  • Image Distance $$3.0 cm$$, Object Distance $$3.0 cm$$
  • Image Distance $$2.0 cm$$, Object Distance $$3.0 cm$$
  • Image Distance $$3.0 cm$$, Object Distance $$5.0 cm$$
  • Image Distance $$3.0 cm$$, Object Distance $$2.0 cm$$
  • Image Distance $$3.0 cm$$, Object Distance $$10.0 cm$$
A real object is placed in front of a convex lens of focal length $$f$$ at its principal focus. Then the image is formed at
  • zero
  • infinity
  • at a distance $$2f$$
  • at a distance $$\dfrac f2$$
In case of concave mirror, the minimum distance between a real object and its real image is :
  • $$f$$
  • $$2f$$
  • $$4f$$
  • $$zero$$
The image distance of an object placed 10 cm in front of a thin lens of focal length +5 cm is at :
  • 6.5 cm
  • 8.0 cm
  • 9.5 cm
  • 10.0 cm
A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be.
  • 10 cm
  • 15 cm
  • 20 cm
  • 30 cm
An object 1 cm tall is placed 4 cm in front of a mirror. In order to produce an upright image of 3 cm height, one needs a
  • convex mirror of radius of curvature 12 cm
  • concave mirror of radius of curvature 12 cm
  • concave mirror of radius of curvature 4 cm
  • plane mirror of height 12 cm
Find the size of the image formed by a spherical mirror from the following data :
$$u = -20\ cm$$, $$f = -15\ cm$$ and height of object $$= 1.0\ cm$$
  • $$6\ cm$$
  • $$5\ cm$$
  • $$3\ cm$$
  • $$4\ cm$$
A ray of light strikes a glass plate at an angle of $${60}^{o}$$. If the reflected and refracted rays are perpendicular to each other, the refractive index of glass is
  • $$\cfrac{\sqrt{3}}{2}$$
  • $$\cfrac{3}{2}$$
  • $$\cfrac{1}{2}$$
  • $$\sqrt{3}$$
Focal length of a convex lens is $$20 cm$$ and its RI is $$1.5$$. It produces an erect, enlarged image if the distance of the object from the lens is
  • $$40 cm$$
  • $$30 cm$$
  • $$15 cm$$
  • $$20 cm$$
When rays of light are incident on a glass slab, then the incident ray and emergent ray are _________ to each other.
  • Perpendicular
  • Parallel
  • Opposite
  • Concurrent
A glass slab is placed in the path of convergent light. The point of convergence of light :
  • Moves away from slab
  • Moves towards the slab
  • Remains at the same point
  • Undergoes lateral shift
The distance between principal focus and optical center of the lens is ________.
  • Diameter
  • Focal length
  • Principal axis
  • Optical center
In the diagram, the correctly marked angles are ______.
608499_326bd4a06758499fada434ab0a19a94d.png
  • $$\angle i$$ and $$\angle r$$
  • $$\angle i$$ and $$\angle e$$
  • $$\angle r$$ and $$\angle e$$
  • $$\angle i$$, $$\angle r$$ and $$\angle e$$
Magnification for mirror $$(m) =$$ ______
  • $$\dfrac {v}{u}$$
  • $$\dfrac {u}{v}$$
  • $$\dfrac {h_{o}}{h_{i}}$$
  • $$\dfrac {h_{i}}{h_{o}}$$
After refraction of light through a glass slab, incident ray and emergent ray are:
  • Perpendicular
  • Parallel
  • In a straight line
  • None of these
For magnification in spherical mirrors object height is :
  • Negative.
  • Positive.
  • For real images positive.
  • For virtual images negative.
Which of the following is Snell's law?
  • $$n_{1}\sin i = \dfrac {\sin r}{n_{2}}$$
  • $$\dfrac {n_{1}}{n_{2}} = \dfrac {\sin r}{\sin i}$$
  • $$\dfrac {n_{2}}{n_{1}} = \dfrac {\sin r}{\sin i}$$
  • $$n_{2}\sin i = constant$$
An object is placed 25 cm from a convex lens whose focal length is 10 cm. The image distance is ________ .
  • 50 cm
  • 16.66 cm
  • 6.66 cm
  • 10 cm
According to the new cartesian sign convention, the ________ is taken as origin
  • Centre of curvature
  • Pole of the mirror
  • Focus
  • Any point on the principal axis
Rays of light are entering from glass to glycerine. If refractive indexes of glass and glycerine are respectively 1.5 and 1.47, find the refractive index of glycerine with respect to glass.
  • 0.03
  • 1.02
  • 2.20
  • 0.98
Why is a Converging lens so called ?
  • The rays of light passing through it meet at a point.
  • The rays of light passing through it pass without any deviation.
  • The rays of light passing through it move away from each other.
  • None of these
Which of the following is correct regarding reflection.
  • Reflection is a phenomenon by which light incident on a surface is sent back into the same medium
  • Reflection is a phenomenon by which light incident on a surface passes into another medium
  • Reflection is a phenomenon by which light incident on a surface is scattered
  • Reflection is a phenomenon by which light incident on a surface is absorbed by the surface
A convex mirror of radius of curvature $$1.6 m$$ has an object placed at a distance of $$1m$$ from it. The image is formed at a distance of :
  • $$\dfrac{18}{3}m$$ behind the mirror
  • $$\dfrac{18}{3}m$$ infront of the mirror
  • $$\dfrac{4}{9}m$$ behind the mirror
  • $$\dfrac{4}{9}m$$ infront of the mirror
The apparent flattening of the sun at sunset and sunrise is due to 
  • refraction
  • diffraction
  • total internal reflection
  • interference
  • polarization
If the angle of incidence is i and that of refraction is r. Then the speed of light in the medium to which the light is reflected from air is?
  • $$\displaystyle v=C\frac{\sin i}{\cos r}$$
  • $$\displaystyle v=C\frac{\cos r}{\cos i}$$
  • $$\displaystyle v=C\frac{\sin r}{\sin i}$$
  • $$\displaystyle v=C\frac{\sin i}{\sin r}$$
If the angle of incidence is twice the angle of refraction in a medium of refractive index $$\mu$$, then the angle of incidence is :
  • $$2\, cos ^{-1}\dfrac{\mu}{2}$$
  • $$2\, sin ^{-1}\dfrac{\mu}{2}$$
  • $$2\, cos ^{-1} \mu$$
  • $$2\, sin ^{-1} \mu$$
In optical instruments, the lenses are used to form the image by the phenomenon of ...................................
  • Reflection
  • Refraction
  • Scattering
  • Diffusion
A ray of light is travelling through a medium of refractive index $$\dfrac {1}{\sqrt {2}}$$ with respect to air. When it is incident on the surface making an angle $$45^{\circ}$$ with the surface, which of the following will take place?
  • Angle of refraction will be $$45^{\circ}$$
  • Angle of refraction will be $$90^{\circ}$$
  • The ray will be internally reflected
  • None of the above
A real object is placed at a distance $$f$$ from the pole of a convex mirror, in front of the convex minor. If focal length of the mirror is $$f$$, then distance of the image from the pole of the mirror is :
  • $$2\, f$$
  • $$\frac{f}{2}$$
  • $$4\, f$$
  • $$\frac{f}{4}$$
Convex lens
  • Shrinks the image
  • Magnifies the image
  • Sharpens the image
  • Increase the contrast of the image
Lens spectacles are made from
  • Soft Glass
  • Hard Glass
  • Pyrex Glass
  • Flint Glass
You are given two lenses, a converging lens with focal length + 10 cm and a diverging lens with focal length -20 cm. Which of the following would produce a real image that is smaller than the object?
  • Placing the object 5 cm from the converging lens
  • Placing the object 15 cm from the converging lens
  • Placing the object 25 cm from the converging lens
  • Placing the object 15 cm from the diverging lens
How will you design a shaving mirror assuming that a person keeps it $$10cm$$ from his face and view the magnified image of the face at the closest comfortable distance of $$25cm$$. The radius of curvature of the mirror would then be:
  • $$24cm$$
  • $$-33.3cm$$
  • $$-24cm$$
  • $$30cm$$
The magnification of the image when an object is placed at a distance x from the principle focus of a mirror of focal length f is?
  • $$\displaystyle\frac{x}{f}$$
  • $$1+f/x$$
  • $$\displaystyle\frac{f}{x}$$
  • $$1-\displaystyle\frac{f}{x}$$
The refractive index of glass with respect to air is $$\dfrac{3}{2}$$ and that of water with respect to air is $$\dfrac{3}{2}$$. What is the refractive index of glass with respect to water?
  • $$9 : 8$$
  • $$1 : 2$$
  • $$2 : 1$$
  • $$8 : 9$$
The phenomenon of bending of light at the surface of separation of two media is called :
  • Refraction of light
  • Reflection of light
  • Deflection of light
  • Absorption of light
Which among these is the angle of incidence?
904084_e46a009833f24538b2471977064eeb7b.png
  • A
  • B
  • C
  • D
Magnification produced by a convex mirror is $$\dfrac{1}{3}$$, then distance of the object from mirror is
  • $$\dfrac{f}{3}$$
  • $$\dfrac{2f}{3}$$
  • $$1f$$
  • $$2f$$
A light ray passes through a glass slab. Which of the following diagrams shows the correct path of the ray?
A plane mirror is placed along the x-axis facing negative y-axis. The mirror is fixed. A point object is moving with $$3\hat{i} \, + \, 4\hat{j}$$ in front of the plane mirror. The relative velocity of image with respect to its object is
  • $$-8\hat{j}$$
  • $$8\hat{j}$$
  • $$3\hat{i} \, - \, 4\hat{j}$$
  • $$-6\hat{i}$$
An object 2 cm high is placed at a distance of 16 cm from a concave mirror, which produces a real image 3 cm high. What is the focal length of the mirror ?
  • -9.6 cm
  • -3.6 cm
  • -6.3 cm
  • -8.3 cm
A rod of length $$10 \ cm$$ lies along the principal axis of a concave mirror of focal length $$10 \ cm$$ in such a way that its end closer to the pole is $$20 \ cm$$ away from the mirror. The length of the image is
  • $$10 \ cm$$
  • $$15 \ cm$$
  • $$2.5 \ cm$$
  • $$5 \ cm$$
A convergent beam of light passes through a diverging lens of focal length $$0\cdot2\ m$$ and comes to focus $$0\cdot3\ m$$ behind the lens. The position of the point at which the beam would converge in the absence of the lens is 
  • $$0.12\ m$$
  • $$0.6\ m$$
  • $$0.3\ m$$
  • $$0.15\ m$$
For which of the pairs of $$u$$ and $$f$$ for a mirror image is smaller in size
  • $$u=-10\ cm$$, $$f=20\ cm$$
  • $$u=-20\ cm$$, $$f=-30\ cm$$
  • $$u=-45\ cm$$, $$f=-10\ cm$$
  • $$u=-60\ cm$$, $$f=30\ cm$$

An object is placed at $$20\ cm$$ form a convex mirror of focal length $$10\ cm.$$ The image formed by a mirror is 
  • Real and at $$20cm$$ from the mirror
  • Virtual and at $$20cm$$ from the mirror
  • Virtual and at $$20/3\ cm$$ from the mirror
  • Real and at $$20/3\ cm$$ from the mirror
A square wire of side 1 cm is placed perpendicular to the principle axis of a concave mirror of focal length 15 cm at a distance of 20 cm. The area enclosed by the image of the wire is:
  • 4 $$cm^2$$
  • 6 $$cm^2$$
  • 2 $$cm^2$$
  • 9 $$cm^2$$
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