Rainbows are formed due to

Which of the following lens is thicker in the middle and thinner at the edges ?

Behind the cornea of human eye, is the opaque muscular diaphragm called

Ultraviolet rays help to produce vitamin

The band of colours that we get when white light splits into its components is known as the

Name the scientist who is often considered as father of modern physics

A medium is said to be optically dense if the speed of light become

The ability of the eye lens to self adjust its focal length is termed as the

When the object is beyond 2F, the image formed is

Refractive index of kerosene is