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An equilateral glass prism can produce a...

An equilateral glass prism can produce a minimum deviation of `30°` to the path of an incident ray. A transpar- ent slab of refractive index 1.5 is placed in contact with one of the refracting faces of the prism. Thickness of the slab is 3 cm. Now calculate the minimum possible deviation which can be produced by this prism-slab combination.

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The correct Answer is:
`30^(@)`
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