Below are two different interference patterns, each created by monochromic light

Question

Below are two different interference patterns, each created by monochromic light incident on two narrow slits. Explain the different features seen in the patterns (the images should be black and white, so ignore any color that you may see). If each interference pattern is created by red light (lambda = 600 nm) and the screens are the same distance from the two slits, what accounts for the difference in the patterns? Explain. If each interference pattern is created by different wavelengths of light and the screens are the same distance from the two slits, which one is created by red light (lambda = 600 nm) and which is created by blue light (lambda = 400 nm)

Explanation / Answer

In this case, in second figure the width is more than the first one.

If both the pattern are formed from red light so wavelength is constant and screen are same distance in both cases. So the only possibility left is the slit width. Pattern width is inversely proportoinal to the slit width. So the second figure has less slit width compared to that of first one.

Now in this case both the pattern are created by two different light. Width of pattern is directly porportional to that of wavelength of light used. So, for first pattern blue light is used and we gets a less width that of second one. For second pattern red light is used and we get a wider pattern.

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