SATHEE: Optics Question 612

Optics Question 612

Question: The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is

[AFMC 1995]

Options:

A) 150 cm

B) 60 cm

C) 30 cm

D) 40 cm

Show Answer

Answer:

Correct Answer: A

Solution:

$ m=\frac{f}{f+u} $

$ \Rightarrow -\frac{1}{4}=\frac{30}{30+u} $

$ \Rightarrow u=-150cm $

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Optics Question 612

Question: The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is

Options:

Answer:

Solution:

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