Question

A diminished image of an object is to be obtained on a screen 1. m away from it . This can be achieved by approximately placing.

Answer 1

A concave mirror of suitable focal length.

(or) a convex lens of focal length less than 0.25 m.

Explanation:

The image required is a real image. So we can rule out convex mirror and concave lens, as they do not form real image. We can either use a concave mirror or a convex lens to obtain the image of an object on a screen.

1. For concave mirror, the object should be beyond C to form a real diminished image between F and C of the mirror.
2. For convex lens, minimum distance between an object and its real image should be 4f. If f is 0.25cm, then the distance of the object can be 1m as required. A real image will be formed between f and 2f on other side of the lens.

Please refer to the attached picture for the ray diagrams.

Answer 2

Answer:

between pole and focus

Explanation:

A diminished image of an object is to be obtained on a screen 1. m away from it . This can be achieved by approximately placing.