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White light is spread out into its spectral components by a diffraction grating


White light is spread out into its spectral components by a diffraction grating. If the grating has 2000 lines per centimeter, at what angle does red light of wavelength 640 nm appear in first-order spectrum? (Assume that the light is incident normally on the grating.) 


Unpolarized light passes through two Polaroid sheets. The transmission axis of the analyzer makes an angle of 43.4° with the axis of the polarizer. 

(a) What fraction of the original unpolarized light is transmitted through the analyzer? (Enter your answer to at least three decimal places.) 

(b) What fraction of the original light is absorbed by the analyzer?  

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