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Q.

A ray of light travels from a medium of refractive index µ to air its angle of incidence in the medium is i measured from the normal to the boundary and its angle of deviation is δ. If δ is plotted against i , which of the following best represents the resulting curve?

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a

b

c

d

answer is A.

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Detailed Solution

The ray of light is refracted at the plane surface. However, since the ray is travelling from a denser to a rarer medium, for an angle of incidence (i) greater then the critical angle (c) the ray will be totally internally reflected.For ic,  deviation d=π−2iδ  decreases linearly with i.δ2 =π−2c=2δ1
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