Optics 4 Question 15

16. A ray of light is incident normally on one of the faces of a prism of apex angle 30 and refractive index 2. The angle of deviation of the ray is …… degrees.

(1997, 2M)

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Solution:

  1. Ray falls normally on the face AB. Therefore, it will pass undeviated through AB.

r2=9060=30

μ=2=sini2sinr2i2=45

Deviation =i2r2=4530=15

(Deviation at face AC only)



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