Question

the focal length of a converging and diverging lens are 40 cm and 20 cm respectively if both these lenses are placed in contact the power of their combination will be
a)-2.5D
b)+7.5D.
c)+2.5
d)-7.5D​

Answer 1

refer the attachment for the answer

Answer 2

Answer:

B. +7.5D

Explanation:

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