The angle of deviation through a prism is minimum when (A) Incident ray and emergent ray are symmetric to the prism (B) The refracted ray inside the prism becomes parallel to its base (C) Angle of incidence is equal to that of the angle of emergence (D) When angle of emergence is double the angle of incidence Choose the correct answer from the options given below :

Statements (A),(B) and (C) are true

Only statements (A) and (B) are true

Statements (B) and (C) are true

HARD

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Consider two equivalent, triangular hollow prisms A and B made of thin glass plates and arranged with negligible spacing as shown in the figure. A beam of white light is incident on prism A from the left. Given that, the refractive index of water is inversely related to temperature, the beam to the right of prism B would not appear white, if

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Important Questions on Ray Optics

HARD

Physics>Optics>Ray Optics>Dispersion of Light

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

EASY

Physics>Optics>Ray Optics>Dispersion of Light

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

EASY

Physics>Optics>Ray Optics>Dispersion of Light

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>Dispersion of Light

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

EASY

Physics>Optics>Ray Optics>Dispersion of Light

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:

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

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

HARD

Physics>Optics>Ray Optics>Dispersion of Light

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>Dispersion of Light

A equiangular glass prism of Refractive Index

1.6

is kept fully immersed in water of refractive index

\frac{4}{3}

for a certain ray of monochromatic light. What is the closest value for the angle of minimum deviation of the light ray in this setup? (Take

\sin 37 ° = 0.6

)

HARD

Physics>Optics>Ray Optics>Dispersion of Light

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>Dispersion of Light

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>Ray Optics>Dispersion of Light

The angle of prism and refractive index of the material of the prism are A and

\cot \frac{A}{2}

respectively. The angle of minimum deviation of the prism is

EASY

Physics>Optics>Ray Optics>Dispersion of Light

The graph between angle of deviation

(δ)

and angle of incidence

(i)

for a triangular prism is represented by :

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to

\frac{3}{4}

of the angle of the prism. The angle of deviation is

EASY

Physics>Optics>Ray Optics>Dispersion of Light

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?

HARD

Physics>Optics>Ray Optics>Dispersion of Light

A ray of light falls upon a

60 °

prism

(μ = \sqrt{2})

and it suffers minimum deviation. The angle of incidence for this ray must be

EASY

Physics>Optics>Ray Optics>Dispersion of Light

The angle of deviation through a prism is minimum when

Question Image

(A) Incident ray and emergent ray are symmetric to the prism

(B) The refracted ray inside the prism becomes parallel to its base

(D) When angle of emergence is double the angle of incidence

Choose the correct answer from the options given below :

EASY

Physics>Optics>Ray Optics>Dispersion of Light

' A'

is the angle of prism,

r

angle of refraction, then the condition for minimum deviation is

HARD

Physics>Optics>Ray Optics>Dispersion of Light

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>Dispersion of Light

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>Dispersion of Light

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:

Important Questions on Ray Optics

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