Question

a focal length of 10cm of a lens forms an erect image, the image is twice the size of the object find the distance between the object and image.(explain with step)

Answer 1

Answer:

ANSWER

Since m=2

focal length =10cm

v

1

−

u

1

=

f

1

→

v

1

−

u

1

=

f

1

Multiply by u on both side;

v

u

−1=

f

u

2

1

=

m

1

=

v

u

=

f

u+f

2=

f+u

f

⇒u=−15 cm