Question

Give notes on 'Special rays on image formation in spherical lens'.

Answer 1

One ray of light becomes parallel to the principal axis of the lens and thus, passes through another focus after refraction through the lens. Another ray of light passes through the optical centre of the lens and goes straight. Therefore, the image formed is: At infinity, Real and inverted, highly enlarged.

Answer 2

Answer:

Explanation:

Ray Diagrams

Ray diagrams are used to depict the image formation by tracing the path of light rays i.e. incident rays and reflected rays. They are drawn in order for anyone to view a point on the image of an object. These ray diagrams depend on the position of the object.

General rules for image formation using ray diagrams:

Any ray of light that passes through the mirror, is always parallel to the principal axis.

Any ray of light that passes through the mirror always passes through the principal focus (f) of the mirror after reflection.

A ray of light passing through the center of curvature of any mirror is reflected back along the same path.

Any incident ray which isn’t parallel to the principal axis is also reflected diagonally and the incident ray and the reflected ray always follow the laws of reflection i.e. the angles formed by these rays are equal to each other.