A thick layer of oil is floating on the surface of water in a tank. A beam of light traveling in the oil is incident on the water interface at an angle of 33.0° from the normal. The refracted beam travels in the water at an angle of 47.5° from the normal.
What is the refractive index of the oil?

Refractive index of oil will be equal to 1.802    

Explanation:

We have given light is incident on water surface at an angle of

Let the refractive index of oil is

Light is refracted in the water at an angle of

Refractive index of water is

We have to find the refractive index oil

From law of refraction

So refractive index will be equal to 1.802

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force