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A hair dresser stand with her nose `20cm` infront of a lane mirror. For what distance must she focus her eyes in order to see her nose in the mirro?

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A hair dresser stand with her nose `20cm` infront of a lane mirror. For what distance must she focus her eyes in order to see her nose in the mirro?
A. `40cm`
B. `50cm`
C. `30cm`
D. `60cm`
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(a) From the figure, image is situated at `40cm` from eye
image
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