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What is the lateral shift of a ray refracted through a parallel-sided glass slab of thickness ‘h’ in terms of the angle of incidence ‘i’ and angle of refraction ‘r’, if the glass slab is placed in air medium ?

1. r tan ) r i tan( h −
2. r sin ) r i cos( h −
3. h
4. r cos ) r i sin( h −

Correct answer: r cos ) r i sin( h −

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