A thin layer of benzene (n = 1.501) lies on top of a sheet of fluorite (n = 1.434). It is illuminated from above with light whose wavelength in benzene is 400 nm. Which of the following possible thicknesses of the benzene layer will maximize the brightness of the reflected light? (i) 100 nm; (ii) 200 nm; (iii) 300 nm; (iv) 400 nm.

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A thin layer of benzene (n = 1.501) lies
on top of a sheet of fluorite (n = 1.434). It is illuminated from above with light whose wavelength
in benzene is 400 nm. Which of the following possible thicknesses of the benzene layer will maximize
the brightness of the reflected light? (i) 100 nm; (ii) 200 nm; (iii) 300 nm; (iv) 400 nm.

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