Question

State the position,nature and size of an image when object placed distance equal to its focal length ? To observe minute parts of watch repairs
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Answer 1

Answer:

Hey

Explanation:

Mirror formula :

v

1

+

u

1

=

f

1

...........(1)

So, u=−27cm

Concave mirror have negative focal length.

f=−18cm

Putting the values in (1),

v

1

+

−27

1

=

−18

1

We get , v=−54cm

Also,

Magnification =

h

1

h

2

=

u

−v

7.0

h

2

=−

−27

−54

h

2

=−14.0cm

Image will be real and inverted and will be of size 14 cm.

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