A hemispherieal paper weight contains a small flower on its axis of symmetry at a distance of 4 cm from its flat surface. Where is the flower appears to an observer when he looks at it along the axis of symmetry from the top? (Index of refraction of glass = 1.5)
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A.15 cm from top B.20 cm from top C.5 cm from top D.25 cm from top

Options

A. 15 cm from top
B. 20 cm from top
C. 5 cm from top
D. 25 cm from top

Answer

C

Explanation

(c ) we have, `mu_(2)/v=mu_(1)/u-(mu_(2)-mu_(1))/R`
`1/v=1.5/(-6)-(1-1.5)/(-10)`
`therefore` v=-5 cm