Light is made incident from water to flint glass. The angle of refraction in flint glass is 23.10°. Find the angle of incidence of light on the flint glass from water. The refractive index of water is 1.33 and that of flint glass is 1.62.

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.