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A prism of a refracting angle 60^(@) is ...

A prism of a refracting angle `60^(@)` is made with a material of refractive index `mu`. For a certain wavelength of light, the angle of minimum deviation is `30^(@)` . For this wavelength, the value of `mu` of material is

A

1.82

B

1.503

C

1.414

D

1.231

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