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# Kelper used total internal reflection in a glass block to deflect a beam of light as shown in the figure. For an angle of the incidence i at the top surface, the minimum refractive index (n) needed for total internal reflection at the vertical surface is (the surrounding medium is air for which n=1)n=1+sin2in=√1+sin2in=√1+cos2in=1+cos2i

A
n=1+sin2i
B
n=1+sin2i
C
n=1+cos2i
D
n=1+cos2i
Solution
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#### Option B is correct

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