One guideline for how diffraction affects shadows is that distinct shadows are created if the width of something is a minimum of 10 times greater than the wave’s wavelength. What would be the narrowest width of something to make a distinct shadow with blue light of frequency = 6.7 X 10^14 Hz? At this particular width, would the shadow be more or less distinct if it is lit up with red light of frequency 4.2 X 10^14 Hz? Consider the speed to be 3.0 X 10^8 m/s in both parts.
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