Optics Question 658
Question: An object has image thrice of its original size when kept at 8 cm and 16 cm from a convex lens. Focal length of the lens is
[UPSEAT 2001]
Options:
A) 8 cm
B) 16 cm
C) Between 8 cm and 16 cm
D) Less than 8 cm
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Answer:
Correct Answer: C
Solution:
m = ± 3, using
For virtual image
For real image
Solving (i) and (ii) we get
