Q19 of 29 Page 109

How do you appreciate the role of Fermat principle in drawing ray diagrams. (AS6)

According to Fermat's principle that light selects the shortest path to travel.
1. This is the reason for the propagation of light in straight lines.
2. We use this principle, when we draw ray diagrams to find the image of an object formed by mirrors to illustrate the laws of reflection, refraction etc.


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