Light of wavelength 600 nm illuminates a diffraction grating.The second-order maximum is at angle 38

Light of wavelength 600 nm illuminates a diffraction grating.The second-order maximum is at angle 38.8 ∘. Part A How many lines per millimeter does this grating have? Part B A laser beam is aimed at a 2.0 cm thick sheet of glass at anangle 40 degrees above the glass(n=1.5).

What is the laser beam’s direction of travel in the glass?

What is its direction in the air(n=1.0) on the other side of theglass? . . .

 
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