Question

height of the image formed by convex lens is 30 centimetre and is magnified by a factor of 2 .what will be the height of the object?
1)25 cm
2)60 cm
3) 80 cm
4) 15 cm



help me ​

Answer 1

Correct option is

D

2

v

1

−

u

1

=

f

1

⇒

v

1

−

−15

1

=

30

1

⇒v=−30

m=

u

v

=−

15

30

m=−2⇒∣m∣=2