1. Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to
itself? Explain using a diagram.
2. How are power and focal length of a lens related? You are provided with two lenses of focal length 20
cm and 40 cm respectively? Which lens will you use to obtain more convergent light?
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Explanation: This is because deviation suffered by the ray in first refraction at one face of slab is equal and opposite to deviation suffered by the ray in 2nd refraction at the other face of the slab.
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