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In Fig. what should be the value of d s...

In Fig. what should be the value of d so that image is formed on the object itself .

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For lens:
`(1)/(v) - (1)/(-15) = (1)/(10), v = +30 cm`
Case I:
If `d = 30` the object for mirror will be at pole and its image will be formed there itself.

Case II:
If the rays strike the mirror normally, they wil retrace and the image will be formed on the object itself
`:. d = 30 - 20 = 10cm` ltbr
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