Question

A 20 cm tall object is placed perpendicular to the principal axis of a covex lens of focal length 10 cm . the distance of the from the lens is 15 cm . find the nature , position and size of the image . also find its magnitude​

Answer 1

Explanation:

h=20cm,f=+10cm,u=−15cm

f

1

=

v

1

−

u

1

⇒

v

1

=

f

1

+

u

1

v

1

=

10

1

+

(−15)

1

,⇒

30

1

.

Therefore, the image distance, v=30 cm

Also, magnification, m=

u

v

=

−15

30

=−2