An angle of refraction is the angle between the refracted ray and the

The correct answer is the Normal.

Explanation:

When the incident ray enters the refracting surface, the ray bends from its original path because of the refractive index of the surface.

The angle of refraction is the angle which is made by the refracted ray and the perpendicular on the surface.

The perpendicular on the surface is known as Normal.

Hence, the angle of refraction is the angle between the refracted ray and the Normal.

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.