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What is chromatic aberration and why does it occur?

Important Questions on Ray Optics and Optical Instruments

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Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

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

MEDIUM

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a 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>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

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 and Optical Instruments>Deviation and Dispersion of light by a Prism

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

MEDIUM

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a 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>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

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

EASY

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

In which colour have maximum dispersion

EASY

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

A thin prism of angle $6 °$ made up of glass of refractive index $1.5$ is combined with another prism made up of glass of refractive index $1.75$ to produce dispersion without deviation. Then find the angle of the second prism.

MEDIUM

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a 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 and Optical Instruments>Deviation and Dispersion of light by a 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

HARD

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

A small angled prism of

4 °

deviates a ray through

2.48 °

. Find the refractive Index of the prism.

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Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

Two lenses of power

- 1.6

D and

+ 2.1

D respectively are placed in contact. The focal length of the combination is

EASY

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

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?

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Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

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

Question Image

MEDIUM

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

If the refractive index of the material of a prism is

μ

and its angle of minimum deviation is

π / 3

then the angle of the prism is

EASY

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

The angle of the prism is

60 °

,angle of deviation is

30 °

, the incident angle is

i

and emergent angle is

e

. For the angle of minimum deviation, the values of

i

and

e

will be

EASY

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

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 and Optical Instruments>Deviation and Dispersion of light by a 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:

MEDIUM

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

An optical system consists of two lenses, one with focal length

50 cm

and the other with focal length

2.5 cm

. The separation between the lenses is

52.5 cm

. The optical system is most likely

MEDIUM

Physics>Optics>Ray Optics and Optical Instruments>Deviation and Dispersion of light by a Prism

A deviation of $2 °$ is produced in the yellow ray when prism of crown and flint glass are achromatically combined. Taking dispersive powers of crown and flint glass are $0.02$ and $0.03$ respectively and refractive index for yellow light for these glasses are $1.5$ and $1.6$ respectively. The refracting angles for crown glass prism will be ________ $°$ (in degree)

(Round off to the Nearest Integer)

What is chromatic aberration and why does it occur?

Important Questions on Ray Optics and Optical Instruments

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