Question 2 3 pts Let a light ray approach a lens with an index of refraction of n-1.68. Calculate the focal length using

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Question 2 3 pts Let a light ray approach a lens with an index of refraction of n-1.68. Calculate the focal length using the radius of curvature for R, to be-20 cm and radius of curvature of R, to be 20 cm. What is the focal length of the lens?

Question 12 3 pts A piece of glass mixture with index of refraction of n-1.66 sits on top of an unknown material with an index of refraction of n-1.53. If a light ray goes through the glass and is incident on the unknown material, find the critial angle for the unknown material.