Problem 21.62 A soap bubble is essentially a very thin film of water (n = 1.33)

Question

Problem 21.62 A soap bubble is essentially a very thin film of water (n = 1.33) surrounded by air. The colors that you see in soap bubbles are produced by interference. Part A What visible wavelengths of light are strongly reflected from a 388-nm-thick soap bubble? Hint: Think about the reflection phase shifts at both boundaries. Express your answer numerically. If there is more than one answer, enter your answers in descending order separated by commas. Ac= 1032,2064,30961 nm Submit Give Up Incorrect; Try Again; 8 attempts remaining

Explanation / Answer

air = 2nd/(m + 1/2) where m = 0,1,2,.....

Only m = 1 and 2 gives the reflected wavelength in the visible spectrum.

For m = 1,    = 688 nm which is reddish

For m = 2,    = 412.8 nm which is violet

Together they look purple.

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