Optics Question 666

Question: If convex lens of focal length 80cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power

[AFMC 2002]

Options:

A) + 6.5 D

B) ? 6.5 D

C) + 7.5 D

D) ? 0.75 D

Show Answer

Answer:

Correct Answer: D

Solution:

1F=1f1+1f21F=1+80+150

F=4003P=34D



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