Question

An object is situated at a distance of f/2 from a convex lens of focal length f. Distance of image will be:(a) + ( f /2) (b) + ( f /3) (c) + ( f /4) (d) – f

Answer 1

(d) – f

Explanation:

For spherical lens, we know that 1/ v - 1 / u = 1/ f

For concave lens, u  = -f / 2 and f is always positive.

So 1 / v - 1 / (f/2) = 1 / f

1 / v = 1 / f - 2 / f = - 1 / f

v = - f

Distance of the image = - focal length. Option D is the answer.

Answer 2

Explanation:

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