Advertisements
Advertisements
Question
The critical angle for glass-air interface is :
Options
24°
48°
42°
45°
Advertisements
Solution
42°
RELATED QUESTIONS
What is a spectrum?
Why is the ratio of the velocities of light of wavelengths 4000Å and 8000Å in vacuum 1: 1?
What do you understand by the statement the refractive index of glass is 1.5 for white light?
The refractive index of air with respect to glass is expressed as `""_g μ_a=sin i /sin r`.
- Write down a similar expression for aμg in terms of the angles i and r.
- If angle r = 90°, what is the corresponding angle i called?
- What is the physical significance of the angle i in part (b)?
Fill in the blank to complete the following sentence:
When light travels from a rarer to a denser medium, it bends ...........
How does the deviation produced by a prism depend on the wavelength of incident light?
What is meant by the refraction of light?
Name the phenomenon responsible in the following case:
Apparent bending of a stick in water
A ray of light moves from a rare medium to a dense medium as shown in the diagram below. Write down the number of the ray which represents the partially reflected ray.

A ray of light PQ is incident normally on the hypotenuse of a right-angled prism ABC as shown in the diagram given below:

(i) Copy the diagram and complete the path of the ray PQ till it emerges from the prism.
(ii) What is the value of the angle of deviation of the ray?
(iii) Name an instrument where this action of the prism is used.
