Suppose a diffraction grating has three slits. (a) If the bottom slit contributes to the zeroth-order maximum, what is the difference between the distances traveled by light from the middle and bottom slits?
(b) What is the difference between the distance traveled by the light from these two slits at the dark mode surrounding the zeroth-order maximum?​

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

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i believe the answer would be:

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