A sharp image is located (7.11x10^1) mm behind a converging lens which has (6.0200x10^1) mm focal length. What is the object distance (in mm)? Give your answer to 3 sf.

A flashlight beam strikes the surface of a pane of glass (n = 1.50) at a (3.56x10^1) angle to the normal. What is the angle of refraction relative to the surface normal? (Give answer in degrees to 3 sf, and assume that the refractive index of air is 1.00)

The speed of light in a certain substance is (8.37x10^1) percent of its value in water. If the refractive index of water is 1.33, what is the index of refraction of this substance? Give your answer to 3 sf.

The speed of light in ice is (2.28x10^0)x10⁸ m/s. What is the index of refraction of ice? Give your answer to 3 sf.

The critical angle for a certain liquid-air surface is (4.64x10^1). What is the index of refraction of the liquid? Give your answer to 3 sf.