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

A point object is placed at a distance of `25cm` from a convex lens of focal length `20cm` .If a glass slab of thickness `t` and refractive index `1.5` is inserted between the lens and object.The image is formed at infinity .Find the thickness?

15 cm

`-15 cm`

`5 cm`

`-5 cm`

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