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The rainbow which forms when a light ray undergoes two total internal reflections inside a raindrop, is termed as:

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Important Questions on Ray Optics

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

Various optical processes are involved in the formation of a rainbow. Which of the following provides the correct order in time in which these processes occur?

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

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>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?

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:

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

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:

EASY

Physics>Optics>Ray Optics>Dispersion of Light

In which colour have maximum dispersion

EASY

Physics>Optics>Ray Optics>Dispersion of Light

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:

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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 :

EASY

Physics>Optics>Ray Optics>Dispersion of Light

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>Ray Optics>Dispersion of Light

Which of the following statement is correct?

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

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

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

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

Which of the following colour suffers maximum deviation in a prism?

EASY

Physics>Optics>Ray Optics>Dispersion of Light

A thin prism

P_{1}

with angle

4 °

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 for

P_{2}

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

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

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:

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MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

Rainbow is a phenomenon due to:

The rainbow which forms when a light ray undergoes two total internal reflections inside a raindrop, is termed as:

Important Questions on Ray Optics

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