Refraction of Light Physics - Refraction of Light

A ray of light is incident as a normal ray on the surface of separation of two different mediums. What is the value of the angle of incidence in this case?

Why is the colour red used as a sign of danger?

Which colour of light travels fastest in any medium except air?

A ray of light passes from water to air. How does the speed of light change?

What is meant by the term ‘critical angle’?

You are provided with a printed piece of paper. Using this paper how will you differentiate between a convex lens and a concave lens?

How is the critical angle of a material related to its refractive index?

Name the factors affecting the critical angle for the pair of media.

What do you understand by the deviation produced by a prism?

A coin placed at the bottom of a beaker appears to be raised by 4.0 cm. If the refractive index of water is 4/3, find the depth of the water in the beaker.

A glass block is having refractive index 3/2, the light ray is incident at an angle 45°. Find the sine of the angle of, refraction inside the glass block.

Write the approximate values of speed of light in (i) air and (ii) glass. Use these values to calculate the refractive index of glass with respect to air.

During sunset and sunrise, the sun is seen when it is slightly below the horizon. Give reason.

Explain briefly what causes the twinkling of stars at night.

State the Snell’s laws of refraction of light.

Why do diamonds sparkle?

A ray of monochromatic light is incident from the air on a glass slab:
(i) Draw a labelled ray diagram showing the change in the path of the ray till it emerges from the glass slab.
(ii) Name the two rays that are parallel to each other.
(iii) Mark the lateral displacement in your diagram.