Question

a convex lens has a focal length 1.1 cm. it produces a real image twice the size of the object. find the distance of the image from the lens​

Answer 1

Answer:

option : C

Explanation:

Correct option is

C

30 cm

Given f = 20 cm, h

1

=2h

0

⇒

h

0

h

1

=m=2

∴

u

v

=2⇒v=2u

∴

v

1

−

u

1

=

f

1

(lens formula)

⇒

2u

1

−

−u

1

=

20

1

⇒

2u

1+2

=

20

1

⇒

2u

3

=

20

1

⇒ u = 30 cm