Question

a concave mirror has a focal length of 20cm and an object is placed at 16 cm from it find position and nature if the image formed by it​

Answer 1

Answer:

The position of the object is between focus and pole so the image formed will be virtual that is behind the mirror. And the image will be erect and enlarged.

Answer 2

Explanation:

Given:

Focal length of concave mirror, f = -20 cm

Distance of object from the mirror, u = -10 cm

use formula, 1/v + 1/u = 1/f

or, 1/v = 1/f - 1/u

or, 1/v = 1/-20 - 1/-10

or, 1/v = -1/20 + 1/10 = 1/20

or, v = +20cm

hence, image position is the 20cm right side from the pole of the concave mirror as shown in the diagram. The image is straight and bigger than the object.