Question

An object is placed 30 cm distance from the concave mirror and image
formed at 12 cm from the pole. Find the focal length of the mirror and mention
the characteristics of the image formed.​

Answer 1

Answer:

Here,

u= -30 cm.

f= -20 cm.

By using mirror formula,

1/v + 1/u = 1/f.

1/v + 1/-30 = 1/-20 .

v= -60 cm.

negative sign indicates that image is in front of the mirror.

Therefore,

The distance between image and object = 60–30 = 30cm.

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Answer 2

Answer:

-8.57cm

Explanation:

use formula

1/f=1/u+1/v

and get focus

the image is inverted and dimimished