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General
Easy
Question
An object is placed in front of a symmetrical convex lens with refractive index 1.5 and radius of curvature 40 cm. The surface of the lens further away from the object is silvered. Under auto-collimation condition, the object distance is
- 20 cm
- 10 cm
- 40 cm
- 5 cm
The correct answer is: 20 cm
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