1.

The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and invertedA. 55cmB. `-75cm`C. 65cmD. 85cm

Answer» Correct Answer - B
Magnification,`m=(f)/(f-u)`
Hence, `m=-2 and f=-50cm`
`-2=(-50)/(-50-u) Rightarrow100+2u=-50`
or `u=(-150)/(2)=-75cm`


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