Question

Rakhi conducts an experiment to produce an image of an object on a screen that is placed at 20 cm from the lens. She uses a convex lens of focal length 15 cm for the experiment. Where should she place the object in order to produce the sharpest image?

Answer 1

Explanation:

Answer. Answer:D. – using a lens of longer focal length, when light rays pass through the lens, it will converge to a point further away from the lens. Hence the sharp image will be formed on the school

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Answer 2

The object in order to product the sharpest image in the $-60cm$ the negative sign indicates that the object is placed in front of the lens.

Explanation:

$v=20cm$

$f=15cm$

lens formula,

$\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$

$\frac{1}{u}=\frac{1}{20}-\frac{1}{15}$

$=\frac{-1}{60}$

$u=-60cm$

The negative sign indicates that the object is placed in front of the lens.