Physics, asked by akshyarishi2020, 7 months ago

the power of concave lens having focal length 40 cm is equal to a. -2. 5D b. 2.5D c. 4D d. -4D

Answers

Answered by Anonymous

5

Answer:

P=1f=1f1+1f2=10.4+1-0.25=-1.5diopter.

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