Question:
A plano-convex lens of focal length 30 cm has its plane surface silvered. An object is placed 40 cm from the lens on the convex side. The distance of the image from the lens is
A plano-convex lens of focal length 30 cm has its plane surface silvered. An object is placed 40 cm from the lens on the convex side. The distance of the image from the lens is
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Silvered lens problems reduce to mirror formula.
Updated On: Mar 17, 2026
- 18 cm
- 24 cm
- 30 cm
- 40 cm
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The Correct Option is B
Solution and Explanation
A plano-convex lens with silvered plane surface acts as a concave mirror of focal length f/2.
f'=(30)/(2)=15 cm
Using mirror formula,
(1)/(f')=(1)/(v)+(1)/(u)
v=24 cm
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