A ray in air hits the surface of water at 41.0 deg. At what angle does it travel in the water?

(Unit=deg)

r = 29.53 degrees

Explanation:

Given that,

Angle of incidence,

We need to find the angle at which it will travel in the water. The refractive index of water is 1.33 and refractive index of air is 1. Using Snell's law as :

r is the angle of refraction

So, the ray will travel at an angle of 29.53 degrees in the water.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.