MEDIUM

12th ICSE

IMPORTANT

Earn 100

A regular $60 °$ glass prism has refractive index $\sqrt{2}$ for a given wavelength. Calculate the angle of minimum deviation $δ_{m}$ . At what angle of incidence should a monochromatic light of this wavelength fall on the face of the prism so as to get a minimum deviation? (use $\sin 30 ° = \frac{1}{2}$ and $\sin 45 ° = \frac{1}{\sqrt{2}}$ ).

Important Questions on Refraction and Dispersion of Light through a Prism

MEDIUM

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 7

What should be the refracting angle of a prism of refractive index

1.5

, so that a light ray incident on the prism at an angle of

50 °

suffers minimum deviation?

MEDIUM

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 8

The angle of a glass prism is

59.5 °

. The angle of minimum deviation is

38.5 °

. Without using the value of refractive index of the glass, calculate the angle of incidence for a ray of light suffering minimum deviation.

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 9

A glass prism whose refracting angle is

72 °

and refractive index

1.66

is kept in a liquid of refractive index

1.33

. Calculate the angle of minimum deviation for the parallel beam passing through the prism. (Given :

\sin 36 ° = 0.5878, \sin 47.2 ° = 0.7336

)

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 10

A parallel beam of light is incident on a face of a

60 °

prism. By rotating the prism, the minimum angle of deviation is measured to be

40 °

. Find the refractive index of the prism material. If the prism is placed in water (refractive index

1.33

), then what would be the new minimum angle of deviation?

MEDIUM

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 11

A ray of light incident at

50 °

on a

60 °

prism suffers minimum deviation. Find the angle of minimum deviation and the refractive index of the material of the prism.

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 12

The refracting angle of a glass prism of refractive index

1.45

60 °

. At what angle should a light ray be incident at the first face of the prism so that it emerges at the second face just parallel to the face?

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 13

A thin prism of refracting angle

10 °

produces a deviation of

5 °

in a ray of light passing through it. Find the refractive index of the prism material and the velocity of light in it.

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 14

A thin prism of glass placed in air produces a deviation of

4 °

in a light ray. If the prism be placed in water, what would be the new deviation?

({}_{a}μ_{g} = \frac{3}{2}, {}_{a}μ_{w} = \frac{4}{3})

A regular 60° glass prism has refractive index 2 for a given wavelength. Calculate the angle of minimum deviation δm. At what angle of incidence should a monochromatic light of this wavelength fall on the face of the prism so as to get a minimum deviation? (use sin 30°=12 and sin 45°=12).

Important Questions on Refraction and Dispersion of Light through a Prism

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