Q.

When unpolarised monochromatic light is incident on doubly refracting crystal, it gives two refracted rays O-ray and E-ray as shown in the figure. If  μo and μE are refractive indices of the crystal for the two rays, then 

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a

Data not sufficient

b

μ0>μE

c

μo<μE

d

μo=μE

answer is B.

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Detailed Solution

μ=sinisinr

Here i is same but r0 is small

Hence μ0>μE

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When unpolarised monochromatic light is incident on doubly refracting crystal, it gives two refracted rays O-ray and E-ray as shown in the figure. If  μo and μE are refractive indices of the crystal for the two rays, then