Question

. a convex lens of power 5 dioptre is combined with a concave lens of power 5 dioptre then what will be the focal length of combination of two lenses *

2 points

+40 cm

- 40cm

Zero cm

Infinity cm

Other

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Answer 1

Answer:

The combined power is the algebraic sum of the individual powers of the lenses. Therefore, the power of the combination of the lenses is - 2.5 D. Therefore, the focal length of the combination of the lenses is 40 cm.

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