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μ=32

Figure shows on object O at a distance of 40 cm from lens, a glass slab at 20 cm from lens. A concave mirror is to be placed such that final image after reflection is formed at object itself. What is/are separation of object from mirror?

A
100 cm or 40 cm
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B
60 cm or 40 cm
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C
102 cm or 82 cm
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D
208 cm or 86 cm
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Solution

The correct option is C 102 cm or 82 cm

Due to presence of slab, the image of lens shifts towards right by t[11μ]=2cm
Thus required distance is 102 cm or 82 cm

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