Question

A ray which seems to be travelling through the focus of a convex mirror passes _____ after reflection.
A) Parallel to the axis
B) Along the same path in opposite direction
C) Through F
D) Through C

Answer 1

Hint: There are 4 principles used for the image formation in the mirror. One of which is when light ray travels through focus then after reflection it will pass parallel to the principal axis. This is the case for all types of mirrors. These principles are used for the formation of images in mirrors.

Complete step by step answer:
When light seems to travel through the focus of a convex mirror then it passes parallel to the principal axis after reflection. There are 4 principles
1. When light travels parallel to the principal axis then after reflection it will pass through focus.
2. When light travels through focus then after reflection it passes parallel to the axis.
3. If the light travels from the centre of curvature then it reflects back from the same path.
4. When light strikes the pole of the mirror then angle of reflection is equal to angle of incidence.
These principles are used in the image formation in mirrors. There are generally 6 cases of formation of image in convex mirrors. 4 cases form real and inverted images whereas other 2 cases form virtual and erect images.

Note: When light travels parallel through the principal axis it passes through focus that means it converges its light at focus. When the light travels in the opposite direction then it passes parallel to the principal axis.