Question

An object 10 cm long is placed at 15 cm away from a convex lens of focal length 10 cm. Find the position and size of image

Answer 1

Answer:

Here u=-15cm

O=10cm

f=10cm

v=?

I=?

By using lens formula, we get

1/v-1/u=1/f

1/v-(1/-15)=1/10

1/v+1/15=1/10

1/v=1/10-1/15

1/v=10-15

150

1/v=-5/150

1/v=-1/30

v=-30cm

Also, m=v/u=I/O

-30/-15=I/10

2=I/10

I=20cm

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