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Q.

Which of the following is correct when a ray of light passes through a prism?


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a

It undergoes refraction thrice           

b

It undergoes refraction twice           

c

It undergoes only reflection           

d

None of these 

answer is B.

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Detailed Solution

When a ray of light passes through a prism, it undergoes refraction for two times.
First when light travels from the rarer to denser medium that is from air to glass, it bends towards the normal that is towards the base of the prism. The second time it moves from denser to rarer medium, that is from glass to air, and then it bends away from normal.
 
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Which of the following is correct when a ray of light passes through a prism?