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A parallel beam is incident on to a lens of focal length $f$ (positive), parallel to its principal axis. A thin prism of vertex angle $A$ and refractive index $μ$ is inserted in the path of the parallel beam before it falls on the lens. The focal point of the image

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Important Questions on Ray Optics

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Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

The angle of a prism is

60^{o}

. When light is incident at an angle of

60^{o}

on the prism, the angle of emergence is

40^{o}

. The angle of incidence

i

for which the light ray will deviate the least is such that

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

A ray of light is incident at an angle of

60^{\circ}

on one face of a prism of angle

30^{\circ}

. The emergent ray of light makes an angle of

30^{\circ}

with incident ray. The angle made by the emergent ray with second face of prism will be:

HARD

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

The refractive index of a prism measured using three lines of a mercury vapour lamp. If

μ_{1}, μ_{2}

and

μ_{3}

are the measured refractive indices for these green, blue and yellow lines respectively, then

HARD

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

A rectangular block is composed of three different glass prisms (with refractive indices $μ_{1}, μ_{2} a n d μ_{3}$ ) as shown in the figure below. A ray of light incident normal to the left face emerges normal to the right face. Then the refractive indices are related by

Question Image

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

The graph between angle of deviation

(δ)

and angle of incidence

(i)

for a triangular prism is represented by :

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

The refractive index of water in a biology laboratory tank varies as

1.33 + \frac{(0.002)}{λ^{2}}

, where

λ

is the wavelength of light. Small pieces of organic matter of different colours are seen at the bottom of the tank using a travelling microscope. Then the image of the organic matter appears

HARD

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

A glass prism has a right-triangular cross section,

A B C

, with

∠ A = 90 °

. A ray of light parallel to the hypotenuse,

B C

and, incident on the side,

A B

emerges grazing the side,

A C

. Another ray, again parallel to the hypotenuse,

B C

, incident on the side,

A C

suffers total internal reflection at the side,

A B

. Which one of the following must be true about the refractive index,

μ

of the material of the prism?

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

A ray of light is incident at

60 °

on one face of a prism of angle

30 °

and the emergent ray makes

30 °

with the incident ray. The refractive index of the prism is

MEDIUM

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

It was found that the refractive index of material of a certain prism varied as

1.5 + \frac{0.004}{λ^{2}},

where

λ

is the wavelength of light used to measure the refractive index. The same material was then used to construct a thin prism of apex angle

10 °

. Angles of minimum deviation

(δ_{m})

of the prism were recorded for the sources with wavelengths

λ_{1}

and

λ_{2}

respectively. Then

MEDIUM

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

What is the required condition, if the light incident on one face of a prism, does not emerge from the other face?

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

Monochromatic light passes through a prism. Compared to that in air, inside the prism the light's

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

The angle of incidence for a ray of light at a refracting surface of a prism is

45^{o}

. The angle of prism is

60^{o}

. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are:

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

A thin prism having refracting angle

10^{o}

is made of glass of refractive index 1.42. This prism is combined with another thin prism made of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

A prism is made up of material of refractive index

\sqrt{2} .

The angle of the prism is

A

. If the angle of minimum deviation is equal to the angle of the prism, the value of

A

HARD

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

In an experiment for determination of refractive index of glass of a prism by

i

v/s

δ

plot, it was found that a ray incident at angle

35^{o}

, suffers a deviation of

40^{o}

and that it emerges at angle

79^{o}

. In that case which of the following is closest to the maximum possible value of the refractive index?

MEDIUM

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

A certain prism produces a minimum deviation of

42 ° .

It produces a deviation of

45 °

when the angle of incidence is either

43 °

62 ° .

The angle of incidence when the prism undergoes minimum deviation is

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

A certain prism is found to produce a minimum deviation of

38 °

. It produces a deviation of

44 °

when the angle of incidence is either

42 °

62 °

. What is the angle of incidence when it is undergoing minimum deviation?

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

The refracting angle of a prism is

A

, and refractive index of the material of the prism is

\cot (\frac{A}{2})

. The angle of minimum deviation is

EASY

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

A parallel beam of light is incident from air at an angle

α

on the side PQ of a right angled triangular prism of refractive index

n = \sqrt{2}

. Light undergoes total internal reflection in the prism at the face PR when

α

has a minimum value of

45^{o} .

The angle

θ

of the prism is:

Question Image

HARD

Physics>Optics>Ray Optics>Refraction and Dispersion of Light through Prism

Monochromatic light is incident on a glass prism of angle A. If the refractive index of the material of the prism is

μ

, a ray, incident at an angle

θ

, on the face AB would get transmitted through the face AC of the prism provided:

Question Image

A parallel beam is incident on to a lens of focal length f (positive), parallel to its principal axis. A thin prism of vertex angle A and refractive index μ is inserted in the path of the parallel beam before it falls on the lens. The focal point of the image

Important Questions on Ray Optics

Learn and Prepare for any exam you want !

A parallel beam is incident on to a lens of focal length $f$ (positive), parallel to its principal axis. A thin prism of vertex angle $A$ and refractive index $μ$ is inserted in the path of the parallel beam before it falls on the lens. The focal point of the image