CBSE Class 12-science Answered
The image of a small electric bulb fixed on wall of a room is to be obtained on opposite wall of a room 3m away by means of large convex lens. What is the maximum possible focal length of the lens required for this purpose?
Asked by Sourav Naval | 01 Jun, 2014, 01:53: PM
Expert Answer
For a certain fixed distance x between object and screen, the lens equation does not give a real solution for u or v if f is greater than x/4.
So, maximum focal length is 0.75 m.
Answered by Faiza Lambe | 02 Jun, 2014, 08:21: AM
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