Physics [1 Mark Question Answer]

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’?

What is meant by the statement, ‘the critical angle for diamond is 24°’?

Define angle of deviation.

A ray of light incident at an angle of incidence ‘i’ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ‘e’.
What can you say about the value of the angle of deviation in such a situation?

A ray of light incident at an angle of incidence ‘i’ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ‘e’.
How is the angle of emergence ‘e’ related to the angle of incidence ‘i’?

Name two instruments of the total refracting prism in which is used.

What is the total reflecting prism?

Name the radiation’s which can be detected by a thermopile.

Name a prism required for obtaining a spectrum of Ultraviolet light.

Can the absolute refractive index of a medium be less than one?

How is the refractive index of a medium related to its real depth and apparent depth?

Define the term refractive index of a medium in terms of velocity of light.

Comment on the statement ‘The refractive index of glass is 3/2.’

For which colour of white light the refractive index of a transparent medium the least? Give the reason for your answer.

Write down the relationship between the critical angle and the refractive index of the medium.

What is the refractive index of water

What is the refractive index of vacuum

Name the phenomenon responsible in the following case:
Twinkling of stars

Name the material for which the refractive index is found to be maximum.

Name the phenomenon responsible in the following case:
Apparent bending of a stick in water

Write a relation between the angle of incidence (i), angle of emergence (e), angle of the prism (A), and angle of deviation (d) for a ray of light passing through an equilateral prism.

How does a ray of light bend when it travels from when it is normal to the interface of the two media.

How does a ray of light bend when it travels from denser to rarer medium.

How does a ray of light bend when it travels from rarer to denser medium

Name one main factor on which the direction of bending of a ray of light depends.

Does the depth of a tank of water appear to change or remain the same when viewed normally from above?

After a robbery, if a window has been broken, there will be tiny particles of glass. Some of these will be found at the scene of the crime and some may be caught in the thief’s clothing. If the police can prove that these particles are identical, they have a strong case.
A method of doing this is to suspend the particles of glass in a special liquid. Light of a single colour is thrown through the liquid and the particles viewed through a microscope. The temperature of the liquid is then slowly altered. This alters the speed of light through the liquid (i.e., it alters the refractive index). At one particular temperature, the particles of glass disappear. It this happens at the same temperature for both sets of glass particles, they probably came from the same broken pane of glass.
Complete and copy the diagram to show how light bends when it travels from the liquid to the glass and back to the liquid, If the light speeds up in the glass.

Show the path of a ray of light when it travels from air into water, the angle of incidence being 30°. Mark the angle of incidence and the corresponding angle of refraction.

A ray of monochromatic light enters a liquid from the air as shown in the diagram given below:

Mark in your diagram the two angles on the surface of separation when the ray of light moves out from the liquid to air.

A ray of monochromatic light enters a liquid from the air as shown in the diagram given below:

Copy the diagram and show in the diagram the path of the ray of light after it strikes the mirror and re-enters the medium of air.

In the diagram below, PQ is a ray of light incident on a rectangular glass block.

Copy the diagram and complete the path of the ray of light through the glass block. In your diagram, mark the angle of incidence by letter ‘i’ and the angle of emergence by the letter ‘e’.

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.

The figure shows two prisms A and B. A monochromatic ray of light PO is incident at the face of the prism A. Complete the diagram to show the path of the ray till it emerges out of the prism B.

A ray of light passes through a right-angled prism as shown in the figure. State the angles of incidence at the faces AC and BC.

The diagram shows the path of a ray of light through a rectangular glass block placed in a liquid of uniform density.

Show with the help of a ray diagram the path of the ray when incident ray normally falls on the first surface of the glass block and passes through the block and the liquid.

The diagram shows the path of a ray of light through a rectangular glass block placed in a liquid of uniform density.

What is the angular, deviation of the emergent ray from the glass block with respect to the incident ray?