Light having a wavelength of 625nm illuminates two slits that are a distance of

Question

Light having a wavelength of 625nm illuminates two slits that are a distance of 1830nm apart. The light then interferes as it passes through the slits to form a series of spots on a screed a distance D away.

a) Determine the angle, ?, to the first bright spot on the screen.

b) Determine the maximum number of bright spots that can exist above or below the central spot.

Light having a wavelength of 625nm illuminates two slits that are a distance of 1830nm apart. The light then interferes as it passes through the slits to form a series of spots on a screed a distance D away. Determine the angle, ?, to the first bright spot on the screen. Determine the maximum number of bright spots that can exist above or below the central spot.

Explanation / Answer

a) sin theta = lambda/d

theta = arcsin( 625.0/1830)=19.97 degrees

b)max m when theta = 90

so m = d/lambda = 1830/625=2.928

so 2 above

and 2 below

so 4

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