Question

The power of lens with focal length 20cm is_____
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Answer 1

Answer:

$the power of a concave lens of focal length 20 cm is 5.0 dioptre. Power of combination of lenses : The focal length of the combination of two lenses placed in contact is given by the relation. Thus the power of combination of lenses is the algebraic sum of the powers of individual lenses.$

Explanation:

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Answer 2

Answer:

bro it is 5 dioptres...

Explanation:

see 20/100cm = 1/5m.

1/1/1/5 = 5...