Optics Question 653

Question: A lens of power + 2 diopters is placed in contact with a lens of power - 1 diopoter. The combination will behave like

[UPSEAT 2000]

Options:

A) A divergent lens of focal length 50 cm

B) A convergent lens of focal length 50 cm

C) A convergent lens of focal length 100 cm

D) A divergent lens of focal length 100 cm

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Answer:

Correct Answer: C

Solution:

$ P=P _{1}+P _{2}\Rightarrow P=+2+(-1)=+1D, $

$ f=\frac{+100}{P}=\frac{+100}{1}=100cm $



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