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Byju's Answer
Standard XIII
Physics
Spherical Mirror Common Terms & Rays
Define Princi...
Question
Define Principal focus and focal length.
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Solution
The point on principal axis, through which an incident light ray travelling parallel to principal axis, passes after reflection from the mirror is called as principal focus.
The distance from pole to the principal focus is known as focal length.
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Define the following terms for a lens:
(a) optical centre
(b) principal axis
(c) principal focus
(d) focal length