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What is principal focus?

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What is principal focus?

Posted by Trisha Singh 7 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Krishna Saw 7 years, 10 months ago

All lines converges and meet on a point that point is know as principal focus

Hardik Patel 7 years, 10 months ago

I dont know

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