Heya ! Mate
tell me.
What is Focal length ??????
harshita01122004:
the distance between the principal focus and the pole is called focal length
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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
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