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Difference between Focus and principle Focus

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Difference between Focus and principle Focus

Posted by Rohini Waghe 5 years, 5 months ago

CBSE > Class 10 > Science

3 answers

Yogita Ingle 5 years, 5 months ago

Principal focus is a point on the principal axis where the rays which are incident parallel to the principal axis meet after reflection.
Principal focus is a point on focal plane and is located on the principal axis.
Focus is a point where rays parallel to each other meet. It is not necessary for the rays to be parallel to the principal axis.
These are infinite foci, all lying in a plane called focal plane.

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Aditya Pandey 5 years, 5 months ago

Very good question u put up

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Aditya Pandey 5 years, 5 months ago

https://youtu.be/1xKSSckSA0Q

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CBSE > Class 10 > Science