A woman stands 1 metre from a plane mirror, then walks 60 cm toward it. How far is her image now from her (ignoring mirror thickness)?

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1. A woman stands 1 metre from a plane mirror, then walks 60 cm toward it. How far is her image now from her (ignoring mirror thickness)?

40 cm

60 cm

80 cm

120 cm

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She is now 40 cm from the mirror, and her image sits an equal 40 cm behind it. The total separation between her and her image is 40 + 40 = 80 cm.