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Dear Ajit,
The image distance after 1st refraction by the lens is=20 cm towards the plane mirror (simply from the lens formulae)
but it will get reflected from the mirror and will try to form at a distance 20 cm in front of the lens. it will then again rf\efracted by the lens and this time u=+20 cm
So again using lens formulae we get, v=20/3 cm from the lens towards the object.
Hence the distance between the image & the object will be=(20 - 20/3)cm
=40/3 cm
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SOUMYAJIT IIT_KHARAGPUR
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