MEDIUM
12th ICSE
IMPORTANT
Earn 100

Define angular dispersion and dispersive power of an optical medium. Explain why deviation is maximum for violet colour and minimum for red colour also explain the dependence of deviation on the refractive index.

Important Questions on Refraction and Dispersion of Light through a Prism

HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 1
A ray of light is incident on a 60° prism of glass of refractive index 1.5 at an angle of 40°. Find the angle of emergence of the ray.
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 2
The angle of a prism is 60° and the angle of minimum deviation is 39°. What is the refractive index of the material of the prism? sin 49.5°=0.76.
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 3
Calculate the refractive index of the material of an equilateral prism for which the angle of minimum deviation is 60°.
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 4
The refractive index of a prism of angle 60° is 1.62 for sodium light. Find the angle of minimum deviation. sin 54.1°=0.81.
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 5
Calculate the angle of minimum deviation for a glass prism of angle 60°, the refractive index of glass being 1.658. What is the corresponding angle of incidence? Given: sin 56°=0.829.
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 4 - Refraction and Dispersion of Light through a Prism>QUESTIONS>Q 6
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).
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.