- A convex lens of focal length 20 cm forms an image at 40 cm from the lens. What is the object distance?
A
30 cm
B
40 cm
C
60 cm
D
20 cm
Answer and explanation
Correct Answer: C — 60 cm
Using lens formula: , solve for u.
ObjectiveMCQ
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30 cm
40 cm
60 cm
20 cm
Using lens formula: , solve for u.