Question

3. An object of size 3cm is placed in front of convex mirror at 10cm having focal lenth 4cm. Where will the image form in this case? ​

Answer 1

Answer:

h

1

=3cm, u=−10cm, f=−20cm

We know that

v

1

+

u

1

=

f

1

⇒

v

1

=

f

1

−

u

1

=

(−20)

1

−

(−10)

1

=−

20

1

+

10

1

=

20

−1+2

=

20

1

∴v=20cm

The image is formed at a distance of 20cm behind the mirror,

And

m=−

u

v

=

h

1

h

2

⇒

(−10)

(20)

=

3

h

2

⇒h

2

=6cm

Answer 2

Answer:

When the object is placed on the centre of curvature, on the principal axis, in front of a concave lens, the image is formed at the same point. The image formed is real and inverted. So, in this case, the object distance is equal to the image distance. Therefore, the object size is equal to the image size

Explanation:

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