Optics Question 586

Question: A thin convex lens of focal length 10 cm is placed in contact with a concave lens of same material and of same focal length. The focal length of combination will be

[CPMT 1972; 1988]

Options:

A) Zero

B) Infinity

C) 10 cm

D) 20 cm

Show Answer

Answer:

Correct Answer: B

Solution:

f=f1f2f1+f2=10(10)10+(10)=1001010=



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