NTSE Stage 2 SAT 2014 Question Paper

Question : 35 of 100

Marks: +1, -0

A convex lens has a focal length of 0.5 m. It has to be combined with a second lens, so that the combination has a power of 1.5 dioptre. Which of the following could be the second lens ?

A concave lens of focal length 2 m
Another convex lens of focal length 0.5 m.
A concave lens of focal length 0.5 m.
A convex lens of focal length 2 m.

Validate

Solution:

1/\F=1/\F_1+1/\F_2

1.5=1/0.5+1/\F_2

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