Question

in a convex lens u= -25 f=10 find v and nature of the image formed​

Answer 1

Explanation:

Given that, f=10cm

a) When u=−9.5cm

v

1

−

u

1

=

f

1

⇒

v

1

=

10

1

−

9.8

1

−

98

−0.2

⇒v=−490cm

So, ⇒m=

u

v

=

−9.8

−490

=50cm

So, the image is erect and virtual.

b) When u=−10.2cm

v

1

−

u

1

=

f

1

⇒

v

1

=

10

1

−

−10.2

1

=

0.2

102

⇒v=510cm

So, m=

u

v

=

−9.8

510