Question

the focal point is located 20 cm from a concave lens. an object is placed 12 cm from the lens. find the image distance. ​

Answer 1

Answer:

Focal length f=−20 cm

Object distance u=−50 cm

Using

v

1

−

u

1

=

f

1

Or

v

1

−

(−50)

1

=

−20

1

We get v=−14.3 cm

Since, v is negative. So image formed is virtual.

Hence, virtual image is formed at a distance of 14.3 cm in front of the lens.

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Answer 2

Explanation:

1/u - 1/v=1/f

1/(-20) - 1/v=1/(-30)

-1/20+1/30=1/v

-3+2/60=1/v

-1/60=1/v

v=-60