A Ray Of Light Incident Normally On Face AB of An Isosceles Prism Travels As Shown In Fig. The Least Value Of The Refractive Index The Prism Must Have Should Be

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Question

A ray of light incident normally on face AB of an isosceles prism travels as shown in fig. The least value of the refractive index the prism must have should be

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Solution

Correct option is

The ray is totally reflected at faces AC and CB. The angle of incidence at each face is at least i_c = 45^o. Therefore

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