A color filter is a transparent material that permits only light of a certain co

Question

A color filter is a transparent material that permits only light of a certain color to pass through. When you place a red filter between a lightbulb and a grating, the pattern on the screen beyond the grating consists of rather wide m =0,1,2, … red bands. Why arent the bright bands on the screen narrow, as they are when you shine a red laser on the grating?

A. Because the intensity of laser is greater than the intensity of light transmitted by the color filter. B. Because the wavelength range of laser is much more broad than the wavelength range of light transmitted by the color filter. C. Because the wavelength range of laser is much less broad than the wavelength range of light transmitted by the color filter. D. Because of the polarisation of light transmitted by the color filter.

Explanation / Answer

The width of the bright fringes depends of the intensity of light. Because the intensity of laser is greater than the intensity of light transmitted by the color filter.

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