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A diverging lens of focal length 10cm is...

A diverging lens of focal length 10cm is placed 10cm in front of a plane mirror as shown in Fig. Light from a very far away source falls on the lens. What is the distance of final image?

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The correct Answer is:
D

Final image (by lens ) object `I_(2)`
u = -30, f=-10
`v = (uf)/(u+f) = (300)/(-30-10) = (300)/(-40) = -7.5`
`therefore` 2.5 cm in front of mirror.
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