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 $
