Question

Calculate distance at which object be kept in front of convex lens of focal length 100cm

Answer 1

The object should be placed at 50 cm away.

Explanation:

Correct statement:

Calculate the distance at which an object should be placed in front of a convex lens of focal length 100 cm to obtain an error image of double its size?

Given data:

Focal length "f" = 100 cm

Magnification "m" = v/u = 2

v = 2u

Using lens mirror formula:

1/f = 1/v + 1/u

1/100 = 1/2u - 1/u

1/100 = 1 - 2/2u

2u = - 100

u = -100/2

u = -50 cm

Hence the object should be placed at 50 cm away.

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