A thin walled glass sphere of radius 2.5...

A thin walled glass sphere of radius 2.5 cm is filled with water. An object (O) is placed at 7.5 cm from the effect of glass wall, at what distance the image (I) of the object , measured from the centre of sphere is formed ? (refractive index of water = 1.333)

20 cm

15 cm

10 cm

7.5 cm

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