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What is by focal

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What is by focal

Posted by Vivek Manwar 3 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Asth A 3 years, 3 months ago

Both type of lens concave and convex

Masuma Syeda 3 years, 3 months ago

Bifocal is a type of lens where both concave lens and convex lens are used. They are used in the condition of presbyopia

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