CBSE Questions for Class 12 Medical Physics Ray Optics And Optical Instruments Quiz 13 - MCQExams.com

Tyndall effect is applicable when?
  • The diameter of the dispersed particle is not much smaller than the wavelength of the light used
  • The diameter of the dispersed particles is much smaller than the wavelength of the light used
  • The refractive indices of the dispersed phase and the dispersion medium must be same
  • The refractive indices of the dispersed phase and the dispersion medium must differ greatly in magnitude
Consider a hemisphere of radius R with centre of curvature at origin O, as shown. Refractive index of material of the hemisphere varies as $$\mu = \frac{2R}{2R-x}$$. Where x is x-coordinate of material point. A ray travelling in air in xy-plane is grazingly incident at O, as shown in the figure. Now answer the following question.
Deviation suffered by the ray just before it comes out of the hemispherical surface


1387631_bfdcf614661245d39c41d9ac74ce72bf.PNG
  • lies between $$ 0^o and 30^o$$
  • lies between $$ 30^o and 45^o$$
  • is greater than $$60^o$$
  • is equal to $$60^o$$
Two  Nicol prisms are first crossed and then one of them is rotated through $$  60^0 $$ . The percentage of incident light transmitted is 
  • $$ 12.5 $$
  • $$ 25.0 $$
  • $$ 37.5 $$
  • $$ 50 $$
The refractive indices of glass and water are 3/ 2 and 4/ 3 respectively. The refractive index of glass with respect to water is
  • 2
  • 8/9
  • 9/8
  • 5/3
A ray incident at an angle $$53^{\circ}C$$  on prism emerges at an angle $$37^{\circ}C$$ as shown in the figure.  If the angle of incidence is made $$50^{\circ}C$$ , which of the following is a possible value of angle of emergence 
1423029_ec5b56a1fcdd42be92e0f3e42a7c9c3b.PNG
  • $$35^{\circ}C$$
  • $$42^{\circ}C$$
  • $$40^{\circ}C$$
  • none 
A ray incident at an angle $$53^{\circ}$$  on prism emerges at an angle $$37^{\circ}$$ as shown in the figure.  If the angle of incidence is made $$50^{\circ}$$ , which of the following is a possible value of angle of emergence 
1423031_f7b8f1e787204888b606328d41692cdc.png
  • $$35^{\circ}$$
  • $$42^{\circ}$$
  • $$40^{\circ}$$
  • $$38^{\circ}$$
A convex lens of focal length $$f$$ produces a real image 3 times the size of an object, then distance of the object from the lens is 
  • $$-\dfrac{2f} { 3}$$
  • $$-\dfrac{\mathrm { f }} { 2}$$
  • $$-\dfrac{\mathrm { f } }{ 4}$$
  • $$-\dfrac{\mathrm {4 f }} { 3}$$
The angular resolution of a $$10cm$$ diameter telescope at a  wavelength of $$5000A$$ is of the order of 
  • $$ 10^{6} \mathrm{rad} $$
  • $$ 10^{-2} \mathrm{rad} $$
  • $$ 10^{-4} \mathrm{rad} $$
  • $$ 10^{-6} \mathrm{rad} $$
What kind of lens is used in the spectacles of a person suffering from Hypermetropia?
  • Convex.
  • Concave.
  • Plano -convex
  • A combination of cocave and convex.
A ray of light is incident on a glass at an angle of $$60^o$$. What would be the refractive index of glass, if reflected and refracted rays are perpendicular to each other ?
  • $$\sqrt{3}$$
  • $$\dfrac{3}{2}$$
  • $$\dfrac{\sqrt{3}}{2}$$
  • $$\dfrac{1}{2}$$
A right-angled prism is set to deviate a ray of light through $$90^o$$ . If the same prism is to be used for deviating through $$180^o$$ , the prism must be turned from the previous set position through the angle :
  • $$45^o$$
  • $$90^o$$
  • $$135^o$$
  • $$180^o$$
The focal lengths of the objective and eye plece of astronomical telescope are $$100cm$$ and $$2cm$$ respectively. The magnitude of magnifying power of telescope for adjustment is
  • $$54$$
  • $$0.02$$
  • $$50$$
  • $$100$$
Two thin prisms are combined to form an achromatic combination.For prism I, $$  A=4^{0}, \mu_{R}=1.35, \mu_{Y}=1.40, \mu_{\nu}=1.42 .  $$ For prism II $$  \mu_{R}=1.7, \mu_{\gamma}=1.8  $$ and $$  \mu_{R}=1.9 .  $$ Find the prism angle of prism II and the net mean deviation.
  • $$ 0.44^{\circ} $$
  • $$ 0.45^{\circ} $$
  • $$ 0.48^{\circ} $$
  • $$ 0.46^{\circ} $$
A student measures the focal length of a convex lens by putting an object pin at a distance 'u' from the lens and measured the distance 'v' of the image pin. The graph between 'u' and 'v' plotted by the student should look like
Distances measured perpendicular to and below the optical center are taken as ________.
  • Zero
  • Negative
  • Positive
  • None of the above
Distances measured perpendicular to and above the optical center are taken as ________.
  • Negative
  • Positive
  • Zero
  • None of the above
The angle of minimum deviation produced by an equilateral prism is $$46^0$$. The refractive index of material of the prism.
  • 1.6
  • 1.5
  • 1.4
  • 1.8
The objective of a telescope has a focal length of $$1.2\ m$$. It is used to view a $$10.0\ m$$ tall tower $$2\ km$$ away. What is the height of the image of the tower formed by the objective.
  • $$2\ mm$$
  • $$4\ mm$$
  • $$6\ mm$$
  • $$8\ mm$$
A thin Prism $$P_1$$ with angle $$4^o$$ and made from glass of refractive index 1.54 is combined with another thin prism $$P_2$$ made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of Prism $$P_2$$ is 
  • $$5.33^0$$
  • $$4^o$$
  • $$3^o$$
  • $$2.6^o$$
For path $$A \rightarrow B$$ optical path is
1612354_f7f408769ff94768b3897da6ccc82e9f.png
  • $$2(a + b)$$
  • $$2 (a - b)$$
  • $$a + b$$
  • $$a - b$$
To focus the image of a nearby object on the retina of an eye
  • The distance between eye-lens and retina is increased
  • The distance of the eye-lens and retina is decreased
  • The thickness of eye-lens is decreased
  • The thickness of eye-lens is. increased
Range the values of tip angle $$\theta$$ for the advice to work as anamorphic de-magnifier is
  • $$\dfrac {1}{3}\cos^{-1}\left(\dfrac {1}{\mu}\right) < \theta < \dfrac {1}{2}\sin^{-1} \left(\dfrac {1}{\mu}\right)$$
  • $$\dfrac {1}{3}\sin^{-1}\left(\dfrac {1}{\mu}\right) < \theta < \dfrac {1}{2}\cos^{-1} \left(\dfrac {1}{\mu}\right)$$
  • $$\dfrac {1}{3}\sin^{-1}\left(\dfrac {1}{\mu}\right) < \theta < \dfrac {1}{2}\sin^{-1} \left(\dfrac {1}{\mu}\right)$$
  • $$\dfrac {1}{3}\cos^{-1}\left(\dfrac {1}{\mu}\right) < \theta < \dfrac {1}{2}\cos^{-1} \left(\dfrac {1}{\mu}\right)$$
A light ray is incident ton face AB of prism ABC as shown in figure. The second prism is kept in such a manner that emergent ray from prism ABC is falling normally on face A'B' of prism A'B'C'. The net deviation produced by the optical' system of the two prisms is :
1760040_0f3a4c1d5d5141afa89622b41190b01a.png
  • $$ 45^{\circ} $$
  • $$ 112^{\circ} $$
  • $$ 32^{\circ} $$
  • $$ 18^{\circ} $$
The ratio of thickness of plates of two transparent medium $$A$$ and $$B$$ is $$6:4$$. If the takes equal time in passing through them, then refractive index of $$B$$ with respect to $$A$$ will be
  • $$1.4$$
  • $$1.5$$
  • $$1.75$$
  • $$1.33$$
A medium shows the relation between the angle of incidence $$i$$ and the angle of refraction $$r$$. If speed of light in the medium is $$nc$$ then value of $$n$$ is 
1824730_ffe44ca9398c4960b39deab2d04b5848.png
  • $$1.5$$
  • $$2$$
  • $$2^{-1}$$
  • $$3^{-1/2}$$
Which of the following ray diagram show physically possible refraction
  • (i)
  • (ii)
  • (iii)
  • None of these
Focal length of convex lens is _________
  • Negative
  • Zero
  • Unity
  • Positive
Ray EF is ____________.
1954226_762f9ff63e764ebbb1a0890809bb9691.png
  • Incident ray
  • Emergent ray
  • Refracted ray
  • None of the above
Focal length of concave lens is ________.
  • positive
  • negative
  • zero
  • none of the above
A lens has focal length of -30 cm . Identify the lens.
  • Convex
  • Cylindrical
  • Concave
  • None of the above
In lenses, all the distances measured to the ________ of the origin are taken as positive.
  • Left
  • Right
  • Below
  • None of the above
What do ray PE denote?
1954218_492742fb080145d8b80bef4e6e7dd578.png
  • Angle of incidence
  • Incident ray
  • Refracted ray
  • Reflected ray
$$\angle$$$$N'EF$$ is __________.
1954232_35c0867846ff479f953c7761110cd430.png
  • angle of incidence
  • angle of emergence
  • angle of refraction
  • None of the above
A lens has focal length of $$+20 cm$$ . Identify the lens.
  • Convex
  • Concave
  • Cylindrical
  • None of the above
In lenses, the distances measured to the left of the origin are taken as _________.
  • Zero
  • One
  • Positive
  • Negative
In case of lenses, object distance is taken to be_______.
  • Positive
  • Zero
  • Negative
  • One
0:0:1


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