Question

The focal length of a concave lens is 0.1 meters. What should be the object distance in order that the image obtained is 0.2 times the size of the object?with full steps

Answer 1

Explanation:

From lens formula

=

1v−

u

1

f

1

v

u

−1=

f

u

v

u

=

f

u+f

u

v

=

u+f

f

For a convex lens f = 0.12m and m=3 then find u

So , 3=

0.12+u

0.12

0.36+3u=0.12

u=−0.08m

Answer 2

Answer:

Explanation:

Data; f=-0.1 b/c of concave lense

P=?(object)

q=0.2p(image)

For:1/f=1/p+1/q

-1/0.1=1/p+1/0.2p

-1/0.1=(0.2+1)/0.2p

-1/0.1=1.2/0.2p

0.2p=-0.1×1.2

0.2p=-0.12

p=-0.6ans