Lucite has an index of refraction of 1.50.What is its critical angle if it is in air?
A)1.16°
B)15°
C)41.8°
D)65.2°
E)87.4°

Question

Quizplus · Accepted Answer

The critical angle is given by the formula:

θc = sin^-1(1/n)

where n is the refractive index of the denser medium (in this case, lucite) with respect to the rarer medium (in this case, air).

Plugging in the values, we get:

θc = sin^-1(1/1.50) = 41.8°

Therefore, the correct choice is C.

Lucite Has an Index of Refraction of 1