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A light ray, going through a prism with the angle of prism 60°, is found to deviate by 30°. What limit on the refractive index can be put from these data?
Angle of prism =A =
Angle of deviation=
We know that;
Angle of minimum deviation is given by =
⇒
⇒
One ray is found to be deviated by. So, the angle of minimum deviation should be either less than or equal to
It should not be more than
So,
Or,
⇒
So, limit on the refractive index =.