Question

A 4cm long object is placed at a distance of 20 cm from a concave mirror of focal length 15 cm.find nature ,position and size of image formed?

Answer 1

Nature of image

Real and inverted

Answer refer to attachment

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Answer 2

Answer:

REAL IMAGE

Postion of object =60cm

Size of image =12cm (enlarged or highly magnified)

Explanation:

Since, the image is only real if

Height of image (in negative) =negative integer

Height of object

Then image is real

And since, - 12= - 3(in negative)

4

Hence, image is real

Position of object = 1 =1+ 1 ==60 CM

F V U

SIZE OF IMAGE = V*HEIGHT OF OBJECT

U

=60*4

20

=12 CM