Question

Define focus. with ray diagram ​

Answer 1

Required Answer :

• When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

• Light ray diagram of an image formed, when the object is placed in between principal focus FF and 2F2F is given in the above figure.

• Lens Formula is given by:- f1=v1−u1.

Answer 2

Answer:

a central point as of attraction ,attention or activity called focus..