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A point object is placed at a distance 2...

A point object is placed at a distance 25cm from a convex lens of focal length 20cm. If a glass slab of thickness t annd refractive index 1.5 is inserted between the lens and object, image is formed at . Thickness t is found to be K times of 5cm. Fink K.

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The correct Answer is:
3
Image is at `oo`, so apparent position of object is at focus `d_(AC)=25cm`
Shift `=5cm=((mu-1)/(mu))trArrt=15cm`
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