Define acoustical grating. How is it different from diffraction grating?
Answers
Answer:
When ultrasonic waves is passing through the liquid , the density of the liquid varies layer by layer due to variation in pressure and hence liquid will acts as Diffraction Grating,so called as Acoustic Grating.
Explanation:
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Answer:
Diffraction grating :
A diffraction grating is an optical element that separates (disperses) light that is made up of several different wavelengths (e.g., white light) into light components by wavelength.
A grating with a large number of equally spaced parallel slits is the simplest type of grating.
Acoustic grating :
When ultrasonic vibrations pass through a liquid, the density of the liquid fluctuates layer by layer due to pressure variations, and the liquid acts as a diffraction grating, which is known as an acoustic grating.