MEDIUM

Earn 100

The angle of deviation depends on the refractive index of the glass.

91.67% studentsanswered this correctly

Important Questions on Optics

MEDIUM

Physics>Optics>Optics>Dispersion of Light and Prism

A ray

P Q

incident on the refracting face

B A

is refracted in the prism

B A C

as shown in the figure and emerges from the other refracting face

A C

R S

such that

A Q = A R .

If the angle of prism

A = 60^{o}

and the refractive index of the material of prism is

\sqrt{3}

, then the angle of deviation of the ray is

Question Image

MEDIUM

Physics>Optics>Optics>Dispersion of Light and Prism

A ray of light is incident normally on a glass slab of thickness

5 cm

and refractive index

1.6

. The time taken to travel by a ray from source to surface of the slab is the same as to travel through glass slab. The distance of the source from the surface is

EASY

Physics>Optics>Optics>Dispersion of Light and Prism

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

MEDIUM

Physics>Optics>Optics>Dispersion of Light and 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>Optics>Dispersion of Light and 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:

EASY

Physics>Optics>Optics>Dispersion of Light and 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>Optics>Dispersion of Light and 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

MEDIUM

Physics>Optics>Optics>Dispersion of Light and Prism

The refracting angle of prism is

A

and refractive index of material of prism is

\cot \frac{A}{2}

. The angle of minimum derivation is

HARD

Physics>Optics>Optics>Dispersion of Light and 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>Optics>Dispersion of Light and 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

EASY

Physics>Optics>Optics>Dispersion of Light and Prism

A prism of angle

A = 1 °

μ = 1.5

. A good estimate for the minimum angle of deviation (in degrees) is close to

\frac{N}{10} .

Value of

N

\dots \dots \dots

MEDIUM

Physics>Optics>Optics>Dispersion of Light and 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

EASY

Physics>Optics>Optics>Dispersion of Light and Prism

A ray is incident at an angle of incidence

i

on one surface of a small angle prism (with angle of prism

A

) and emerges normally from the opposite surface. If the refractive index of the material of the prism is

μ

, then the angle of incidence is nearly equal to:

EASY

Physics>Optics>Optics>Dispersion of Light and 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>Optics>Dispersion of Light and Prism

The focal length of a thin convex lens for red and blue rays are

100 cm

and

96.8 cm

respectively. Then, the dispersive power of the material of the lens is

EASY

Physics>Optics>Optics>Dispersion of Light and Prism

A glass slab of thickness

4 cm

contains the same number of waves as in

x cm

of water column when both are traversed by the same monochromatic light. If the refractive indices of glass and water for that light are

\frac{5}{3}

and

\frac{4}{3}

respectively, the value of

x

will be

EASY

Physics>Optics>Optics>Dispersion of Light and Prism

In which colour have maximum dispersion

MEDIUM

Physics>Optics>Optics>Dispersion of Light and 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

MEDIUM

Physics>Optics>Optics>Dispersion of Light and 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>Optics>Dispersion of Light and 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

The angle of deviation depends on the refractive index of the glass.

Important Questions on Optics

Learn and Prepare for any exam you want !