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The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3 m away by means of a large convex lens.

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asked Jan 8, 2018 in Physics by sforrest072 (157,439 points) ● 63 ● 447 ● 1246

The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3 m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?

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answered Jan 8, 2018 by mdsamim (213,225 points) ● 5 ● 10 ● 21
selected Jan 8, 2018 by sforrest072
 
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Distance between the object and the image, d = 3 m

Hence, for the required purpose, the maximum possible focal length of the convex lens is 0.75 m.

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