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Byju's Answer
Standard IX
Physics
Reflection From a Curved Surface
Define Princi...
Question
Define Principal Axis?
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Solution
Principal Axis:
The straight line passing through the pole and the centre of curvature of the spherical mirror is called the principal axis of a spherical mirror
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Q.
Define the following terms for a lens:
(a) optical centre
(b) principal axis
(c) principal focus
(d) focal length