Question

An object of height 1.1 cm is placed in front of a concave mirror of focal length 18 cm.Find the height of the image when the object is placed at
a) 9cm b) 24cm c) 42cm d) 12cm

Answer 1

Answer:

Correct option is

B

concave mirror of radius of curvature 12 cm

Given,

h

0

=1cm;h

i

=3cm

u=−4cm

m=

h

0

h

1

=

1

3

=3

m=

v

v

=3⇒v=3u

f

1

=

v

1

+

u

1

=

12

1

−

4

1

=

12

1−3

=

12

−2

=

6

1

f=−6cm

The mirror must be concave mirror of focal length 6 cm i.e.,

R=2f=12cm

Explanation:

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Answer 2

Answer:

option a

Explanation:

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