3. A continuous light wave is reflected at a normal incidence from a mirror surf

Question

3. A continuous light wave is reflected at a normal incidence from a mirror surface, as shown below. The original light wave and the reflected light wave will then superimpose in the region in front of the mirror. If the wavelength of the light is 405 nm, what would be the periodicity of the optical intensity profile in this region? What would be the speed of the resulting wave? Assume that the numerical value of intensity is the square of the resulting electric field at any point in space. [You may not need this following information in solving this problem, but for completeness: the reflected wave suffers a phase jump when it reflects from a denser media, ie. the wave reflects back to the rarer medium.]

Explanation / Answer

in this case the stationary wave we be produced .

and periodicity of the wave in half of the wavelength which is 202.5nm

and the wave is stationary so the speed is considered as zero.

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