Question

concave mirror produces an image at a distance of 75 cm from the mirror when the object is kept at a distance of 40 cm from the mirror image being real where will the image be formed if object is at a distance of 60 cm from the mirror
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Answer 1

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Answer 2

Answer:

When an object is placed at a distance of 60 cm from a convex mirror, the magnification produced is 1/2. Where should the object be placed to obtain a magnification of 1/3?

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Answer

u=−60cm

u

−v

=

2

1

⇒

−60

−v

=

2

1

⇒v=30cm

⇒

v

1

+

u

1

=

f

1

⇒

f

1

=

30

1

+

−60

1

⇒

f

1

=

60

2−1

=

60

1

⇒f=60cm

Now magnification=

3

1

u

−v

=

3

1

⇒v=

3

−u

∴

v

1

+

u

1

=

f

1

⇒

3

−u

1

+

u

1

=