EASY

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Assertion : Dispersive power of an equilateral triangular prizm is greater than a thin lens if both are kept in air

Reason : Despersive power is $β = \frac{n_{v} - n_{r}}{n_{y} - 1}$ is valid only for thin prizm, but not valid for a lens

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Important Questions on Ray Optics

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

Which is the following colourful patterns is due to diffraction of light?

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

The separation of a beam of light into its constituent wavelengths is called

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

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

If the refracting angle of a prism is

60 °

and minimum deviation is

30 °

, then the angle of incidence will be

EASY

Physics>Optics>Ray Optics>Dispersion of Light

In the given figure, what is the angle of prism?

Question Image

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?

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

EASY

Physics>Optics>Ray Optics>Dispersion of Light

In which colour have maximum dispersion

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:

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

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>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:

Question Image

EASY

Physics>Optics>Ray Optics>Dispersion of Light

Dispersion without deviation is produced by two thin (small angled) prisms which are combined together. One prism has angle

5 °

and refractive index

1.56 .

If the other prism has refractive index

1.7,

what is its angle?

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 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

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

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}

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

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

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

Assertion : Dispersive power of an equilateral triangular prizm is greater than a thin lens if both are kept in air Reason : Despersive power is β=nv-nrny-1 is valid only for thin prizm, but not valid for a lens

Important Questions on Ray Optics

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Assertion : Dispersive power of an equilateral triangular prizm is greater than a thin lens if both are kept in air

Reason : Despersive power is $β = \frac{n_{v} - n_{r}}{n_{y} - 1}$ is valid only for thin prizm, but not valid for a lens