Optics Question 677

Question: An object placed 10 cm in front of a lens has an image 20 cm behind the lens. What is the power of the lens (in dioptres)

[MP PMT 1995]

Options:

A) 1.5

B) 3.0

C) ? 15.0

D) + 15.0

Show Answer

Answer:

Correct Answer: D

Solution:

u=10 cm,  v=20 cm

1f=1v1u=120(110)=320f=203 cm

Now P=100f=10020/3=+ 15 D



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