What would happen when a ray of light falls normally on a surface ?
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https://www.meritnation.com/ask-answer/question/what-happens-when-a-ray-of-light-falls-normally-on-the-surfa/light-reflection-and-refraction/2671955
https://www.meritnation.com/ask-answer/question/what-happens-when-a-ray-of-light-falls-normally-on-the-surfa/light-reflection-and-refraction/2671955