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Power of a Lens

Riya cannot c...

Question

Riya cannot clearly see the bird sitting on a tree with naked eyes. However, when she used her spectacles of power –4 dioptre, she was able to see it clearly. Calculate the focal length of her lens.

A

15 cm

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B

20 cm

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C

25 cm

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D

30 cm

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Solution

The correct option is C 25 cm

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