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Q.

Is it true that the angle of refraction cannot exceed 90°?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
The maximum possible angle of refraction is 90 degrees. If the angle of refraction were greater than 90 degrees, then the refracted ray would lie on the incident side of the medium - that's not possible. When the refraction of light occurs, the incident light rays bend. The refracted light ray either bends towards or away from the normal. If the incident light ray is at 90 degrees, it is parallel to the normal and cannot bend away or towards it. If the light ray doesn't bend, then refraction doesn't occur.
 
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