The imageof a small electric bulb fixed on the wall of a room is to beobtained on the opposite wall 3 m away by means of a large convexlens. What is the maximum possible focal length of the lens requiredfor the purpose?

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Solution

Distancebetween the object and the image, d= 3 m
Maximumfocal length of the convex lens =
For realimages, the maximum focal length is given as:
Hence, forthe required purpose, the maximum possible focal length of the convexlens is 0.75 m.

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The imageof a small electric bulb fixed on the wall of a room is to beobtained on the opposite wall 3 m away by means of a large convexlens. What is the maximum possible focal length of the lens requiredfor the purpose?

Distancebetween the object and the image, d= 3 mMaximumfocal length of the convex lens =For realimages, the maximum focal length is given as:Hence, forthe required purpose, the maximum possible focal length of the convexlens is 0.75 m.

Distancebetween the object and the image, d= 3 m
Maximumfocal length of the convex lens =
For realimages, the maximum focal length is given as:
Hence, forthe required purpose, the maximum possible focal length of the convexlens is 0.75 m.