State Huygens Principle ??? Derive laws of reflection and refraction using it ...

https://www.meritnation.com/ask-answer/question/itss-urgent-draw-reflected-wave-front-on-the-basis-of-huyge/wave-optics/6383220

Please refer to the given link for answer to a similar query. You can try to derive the law of refraction on your own from that. Feel free to ask if you have any doubts in the same.

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