Question

a concave lens has focal length of 15 cm.At what distance should the object
form the lens be placed so that it forms an image at 10 cm from the lens?also,find the magnification produced by the lens.​

Answer 1

Explanation:

Thus the object should be placed at a distance of 30 cm on the left side of the concave lens.

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$perimeter \: of \: rectangle = 2(l + b)$

Answer 2

Answer:

Thus the object should be placed at a distance of 30 cm on the left side of the concave lens.

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perimeter of rectangle = 2 (l+b)