1.

A concave lens has a focal length of 15 cm. At what distance should the object from the lens be placed so that if forms an image at 10 cm from the lens? Also, find the magnification produced by the lens.

Answer»

Solution :f=-15cm, a=-10cm, u=?
`1/v-1/u=1/f`
`1/10-1/u=1/(-15)`
`=(-3+2)/30=-1/30`
`impliesu=-30cm`
Magnification `m=e/u=(-10)/(-30)`
`=1/3`


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