All Problems

Diffraction of Light

Problem 5.110

A plane light wave with wavelength λ=0.60μm\lambda=0.60 \mu \mathrm{m} and intensity I0I_{0} falls normally on a large glass plate whose side view is shown in Fig. 5.22.5.22 . At what height hh of the ledge will the intensity of light at points located directly below be (a) minimum; (b) twice as low as I0I_{0} (the losses due to reflection are to be neglected).

Reveal Answer
 5.110. (a) h=0.60(2k+1)μm; (b) h=0.30(2k+1)μm. Here k=0,1,2,…\begin{array}{c} \text { 5.110. (a) } h=0.60(2 k+1) \mu \mathrm{m} ; \text { (b) } h=0.30(2 k+1) \mu \mathrm{m} . \\ \text { Here } k=0,1,2, \ldots \end{array}
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