Optics Question 607

Question: Two lenses of power 6D and - 2D are combined to form a single lens. The focal length of this lens will be

[MP PET 2003]

Options:

A) 32 m

B) 14 m

C) 4 m

D) 18 m

Show Answer

Answer:

Correct Answer: B

Solution:

Combined power P=P1+P2=62=4D .

So focal length of combination F=1P=14m



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