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Importance of Light in Nature

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Questions and Answers

What is light and how does it help us perceive the world around us?

Light is electromagnetic radiation that causes the sensation of vision. It helps us see the wonders of nature and man-made objects in our surroundings.

Why do we need polished surfaces for reflecting light?

Polished surfaces absorb less light and reflect maximum light, creating clear images.

What is the scientific definition of a mirror?

A surface that reflects light and creates clear images is called a mirror.

What are the two main types of mirrors commonly used?

The two main types of mirrors are plane mirrors and spherical mirrors. Signup and view all the answers

How are plane mirrors made?

Plane mirrors are made by coating the back surface of a flat and smooth glass piece with a thin, reflecting film of aluminium or silver. Signup and view all the answers

Why is another coat of a substance like lead oxide given over the reflecting film on mirrors?

Another coat of a substance like lead oxide is given over the reflecting film to protect it and make that side opaque. Signup and view all the answers

Explain how an image is formed by a point source in front of a mirror.

Reflected rays appear to be coming from a point behind the mirror, creating a virtual image. Signup and view all the answers

What happens to light rays falling perpendicularly on a mirror?

They are reflected back in the perpendicular direction. Signup and view all the answers

Describe what happens when incident rays from a point source get reflected by a plane mirror.

The reflected rays appear to meet at the image point behind the mirror. Signup and view all the answers

Why are images formed by reflection in a mirror called 'virtual images'?

The reflected rays do not actually meet; they only appear to be coming from a point behind the mirror. Signup and view all the answers

What happens when an extended source is placed in front of a mirror?

An extended image of the whole source is formed. Signup and view all the answers

How does the perpendicular distance of the image from a mirror relate to the source distance?

The perpendicular distance of the image from the mirror is equal to the perpendicular distance of the source from the mirror. Signup and view all the answers