Ray Optics and Optical Instruments - Result Question 47

49. A lens is placed between a source of light and a wall. It forms images of area A1 and A2 on the wall for its two different positions. The area of the source of light is

[1995]

(a) A1A2

(b) A1+A22

(c) A1A22

(d) 1A1+1A2

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Answer:

Correct Answer: 49. (a)

Solution:

  1. (a) Size of images =A1 and A2. From the displacement method, the area of the source of light =A1A2.


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