Question

Define the following terms :-

•Principal focus
•Principal axis
•Centre of curvature
•Focal Length​

Answer 1

the point at which the Ray of light parallel to the principal axis is said to be as focus

.

principal axis is the straight line drawn from center of curvature

.

center of curvature is the point at which the Ray of light passes without deviation

.

the distance between the focus and the center of curvature...

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Answer 2

PrPrincipal focus
•Principal axis
•Centre of curvature
•Focal Length​incipal focus
•Principal axis
•Centre of curvature
•Focal Length:- the distance between pole and principal focus in a spherical mirror...
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