Question

A convex lens of power 5D and a concave lens of power 7.5D are placed in contact with each other. a. What is the power of this combination? b. What is the focal length of this combination?

Answer 1

Answer:

hey mate here is ur answer

power of convex lens P1 : +5D

power of concave lens P2 : -7.5D

the combined power is the algebraic sum of the lenses.

hence, power of the combination P = P1 + P2

P = 5D - 7.5D

= -2.5D

hence power of combination is - 2.5 D

hope it helps you

Answer 2

Answer:  

dude alfdon vlogz here is ur answer mate

the power is

5D + (-7.5) = -2.5

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Explanation:

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