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A lens is made of three thin different m...

A lens is made of three thin different mediums. Radius of curvature and refractive index of each medium is shown iin Figure., Surface AB is straight. An object is placed at some distance from the lens by which a real image is formed on the screen placed at a distance of 10cm from the lens. Find the distance of the object from the lens.

A

24 cm

B

20 cm

C

4 cm

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
for convex lens
`1/v-((1)/(-20))=1/40`
`V=-40cm`
For concave lens `u=-60cm`
`1/v-((1)/(-60))=(1)/(-40)`
`v=-24` cm from concavve lens
So from convex lens image is at `24-(20)=4` cm
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