ObjectiveMCQ
Print Protected
This page is protected for print. Use the website to view the content.
A convex lens of focal length 20 cm forms an image at 40 cm from the lens. What is the object distance?
30 cm
40 cm
60 cm
20 cm
Correct Answer: C — 60 cm
Using lens formula: 1/f=1/v−1/u1/f = 1/v - 1/u1/f=1/v−1/u, solve for u.
