Ray Optics and Optical Instruments - Result Question 40
41. A body is located on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance ’ ’ ahead of second wall, then the required focal length will be
[2002]
(a) only
(b) only
(c) more than
(d) less than
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Answer:
Correct Answer: 41. (b)
Solution:
- (b) Using the lens formula
Given
By sign convention