47. If a thin film has a thickness that is A. of a wavelength, constructive inte

Question

47. If a thin film has a thickness that is A. of a wavelength, constructive interference will always occur. B. 4 of a wavelength, destructive interference will always occur. C. % of a wavelength, destructive interference will always occur. D. None of the above is always true. E. Any of above is always true 48. EMW pas sing through a double-slit arrangement is viewed on a distant screen. The interference pattern observed on the screen would have the narrowest spaced fringes for the case of, A. Gamma wave and small slit space B. Infrared wave and large slit space. C. Gamma wave and small slit space D. Infrared and large slit space. E. Any of above.

Explanation / Answer

47) a- 1/4 of a wavelength constructive interference will always occur.

constructive interference will occur if a thin film thickness has a multiples of 1/4 of the wavelength ,ie 1/4 or 3/4 or 5/4

and destructive interference will occur when film thickness is in mutiples of 1/2 which can be 1/2 or 1 or 3/2 etc.

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