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Q.

A spherical surface of radius of curvature 10cm separates two medium X and Y of refractive indices 43 and 32 respectively. If the object is placed along principal axis in medium X, then 

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a

Image is always virtual.

b

Image is real if the object distance is greater than 90 cm.

c

Image is virtual if the object distance is less than 90 cm.

d

Image is always real.

answer is C.

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Detailed Solution

For spherical surface ,μyV-μxU=μy-μxR
Here R and U are negative. So to make the Limits of the above equation, V must always be negative.

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