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Q. The interior of a hollow metal sphere is polished to serve as a mirror. At a point 12 cm from the centre of the sphere of radius 24 cm, a point source of light is placed. Locate its image formed by two successive reflections, the first reflection taking place at the (a) far wall (b) near wall.

Dear Student,a.far wallu=-36,f=-12 cm 1v+1u=1f1v+1-36=1-121v=136-112v=-18 cm for second reflection u=-24+24-18=-30 cm,f=-12cm .1v+1u=1f1v+1-30=1-121v=130-112=2-560v=-20  cmimage will 4 cm from the center Regards

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