Question

what is the rules of light during refraction.
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Answer 1

1. The angle of incident ray(which in the figure is represented by i in the 1st medium is equal to the emergent angle, which in the figure is represented by e.

2. The reflected ray from medium 2, I.e., r is equal to the incident ray of medium 2 which is R.

Thus, R=r.

3. The incident ray of 1st medium is a ray going parallel to emergent ray.