Question

Heya ! Mate


tell me.


What is Focal length ??????

Answer 1

ANSWER :

Firstly To know the Concept of Focal length u should know about Pole and focus of mirror .

Principal Focus :

Focus is a point on principal axis on which the ray of light coming parallel to principal axis intersect After refection.

It is denoted by F

Pole :

Pole is the centre of the mirror .

Now come to your question

What is focal length ??

Here is Answer :

Distance between pole to principal focus is known as Focal length (f).

Focal length is half of Radius of curvature.

Focal length = Radius /2

Thanks !!!

Answer 2

Hola Mate

Refer to the attachment: