Question

Please answer fast!!!!!!!!!!!
An image 2 times the size of the object is obtained with a convex lens of focal length 18cm. What are the possible positions of the object? Calculate the two possible distances of the object from the lens. Also calculate the image distance.

Answer 1

Answer:

By using lens formula

v

1

−

u

1

=

f

1

where v=24cm ,f=18cm

24

1

−

u

1

=

18

1

from this we get u=−72cm

magnification of lens is m=

u

v

m=

−72

24

=−

3

1