A real image, 4/5 size of the object is formed 18 cm from a lens. Calculate the focal length of the lens.

+1 vote
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asked Jan 20, 2018 in Physics by Kundan kumar (49,132 points) 34 384 1027

A real image, 4/5 size of the object is formed 18 cm from a lens. Calculate the focal length of the lens.

1 Answer

+1 vote
answered Jan 20, 2018 by Vikash Kumar (144,729 points) 8 11 21
selected Jan 20, 2018 by Kundan kumar
 
Best answer

Since the image is real and diminished, the lens must be convex and the object must be placed beyond 2F.

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