During a class demonstration, monochromatic light passes through a pair of ident

Question

During a class demonstration, monochromatic light passes through a pair of identical slits to create the sample pattern shown above. If the one of the original slits is covered so that light only passes through one of the slits, which of the other intensity graphs (A-E) results? ____ In the figure to the right, a laser positioned on a ship is used to communicate with a submarine resting on the bottom of a lake. The laser is positioned 12 m above the surface of the water, and strikes the water 20 m from the side of the ship. The water is 76 m deep and has an index of refraction of 1.33. How far is the submarine from the side of the ship (horizontally)? 84.1 m 64.1 m 104 m 74.1 m 94.1 m

Explanation / Answer

8)

when one slit is closed

the intendity is due single slit diffraction.

In diffraction most of the ins=tensity in on the central bright

OPTION (D)

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let i be the incident angle

tani = x1/h = 20/12

i = 59 degrees

from snell's law of refraction

nair*sini= nwater*sinr

1*sin59 = 1.33*sinr

r = 40.13 degrees

tanr = x2/d

x2 = d*tanr = 76*tan40.13 = 64.1

distance of submarine from the side of ship = x1 + x2 = 20 + 64.1 = 84.1 m <<<<-------answer

OPTION(a)

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