Refraction of light is the phenomenon of change in the path of light ray when it goes from one medium to another. State the laws of refraction

Refraction of light is the phenomenon of change in the path of light ray when it goes from one medium to another.The radius of curvature of each face of a convex lens made of glass of refractive index 1.5 is 30 cm. Calculate the focal length of the lens in air.

The physical quantity that remains unchanged when a sound wave goes from one medium to another is

Raju passes a ray of yellow colour through an equi lateral prism and the path of the ray is as shown in the following figure. State the laws of refraction.

Draw the diagram of a light ray travelling from rarer to denser medium

A light ray is travelling from rarer to denser medium. State the law relating i and r for retracted ray