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Refraction of Light at Plane Surfaces
Question
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A ray of light is moving from a rarer medium to a denser medium and strikes a plane mirror placed at 90o to the direction of the ray as shown in the diagram.

i) Copy the diagram and mark arrows to show the path of the ray of light after it is reflected from the mirror.

ii) Name the principle you have used to mark the arrow to show the direction of the ray. 

Answer

i) The direction of the ray of light is as shown below:
 
ii) The principle of reversibility of light. 

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Some More Questions From Refraction of Light at Plane Surfaces Chapter

Draw the diagram given below and clearly show the path taken by the emergent ray. 

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

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

Light passes through a rectangular glass slab and through a triangular glass prism. In what way does the direction of the two emergent beams differ and why? 

A ray of light moves from a rarer medium to a denser medium as shown in the diagram given 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 alongside:

                                            

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? 

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



i) 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.

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