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A parallel beam of light is incident on ...

A parallel beam of light is incident on a lens of focal length 10 cm. A parallel slab of refractive index 1.5 and thickness 3 cm is placed on the other side of the lens. Find the distance of the final image from the lens.
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The correct Answer is:
A, C
As rays are parallel to the principal axis. Image is created by lens at the focus, By placing of glass-slab
Shift `= (1-(1)/(mu)).t =(1-(1)/(1.5))3=1 cm`
Irrespective of separation
Image is shifted to the night by `1 cm`
Total distance from lens.
`10 + 1 = 11 cm`.
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