1000+ General Knowledge Questions and Answers in English - 1

Question: 1

What is refraction of light?

The phenomenon of bending of light as it passes from one medium to another is known as the refraction of light.

Question: 2

What is reflection of light?

When a beam of light falls on a plane mirror, it is sent back into the medium from which it came. This is called reflection of light.

Question: 3

What is focal point?

In a concave mirror, the light rays coming parallel to the principal axis after reflection will converge at a point on the principal axis. This point is called the principal focus or focal point.

In a convex mirror, the light rays coming parallel to the principal axis after reflection will appear to diverge from a point on the principal axis. This is called principal focus.

Question: 4

What is bifocal lens?

It is a lens which can be used not only to see distant object but also nearer object. It has both converging and diverging lens.

Question: 5

Define focal length of a lens?

The focal length of lens is the distance between optic centre and principal focus of the lens.