Question

A student uses a lens of focal length 40 cm and another of - 20 cm. The power and focal length of the combination will be: Power of Combination Focal length of Combination
(a) - 2.5 D - 40 cm
(b) + 2.5 D + 40 cm
(c) + 5.0 D + 20 cm.
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Answer 1

Answer:

see the pic u will get your answer.

Explanation:

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Answer 2

i didn't get ur ans.

pls repost it questions.

same sis they r reporting a question

oh same sis