1.

In Fig.(i), a lens of focal length 10 cm is shown. It is cut into two parts and placed as shown in Fig.(ii). An object AB of light 1 cm is placed at a distance of 7.5 cm. The height of the image will be

Answer»

`2 cm`
`1 cm`
`1.5 cm`
`3 cm`

SOLUTION :`1/F=1/(f_1)+1/(f_2)=1/10+1/10`
`:. F=5 cm`
`1/v-1/-7.5=1/(+5)`
`:. V=+15 cm`
`m=v/u=(+15)/(-7.5)=-2`
`I=mO=(-2)(1CM)`
`=-2 cm`


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