An yellow laser (lambda = 600nm) shines on a single or a double slit and produce

Question

An yellow laser (lambda = 600nm) shines on a single or a double slit and produces a pattern on a screen 1.2m from the slit(s). The second dark spot is 4cm from the central bright spot.

1. Is this a single or double slit? (Expain your reasoning)

2. If it is a single slit, what is the width? If it is a double slit, what is the separation?

An yellow laser (lambda = 600nm) shines on a single or a double slit and produces a pattern on a screen 1.2m from the slit(s). The second dark spot is 4cm from the central bright spot. Is this a single or double slit? (Expain your reasoning) If it is a single slit, what is the width? If it is a double slit, what is the separation?

Explanation / Answer

Part 1)

This is a single slit since the width of the central maximum is twice the width of the other maxima.

(For a double slit, all widths would be the same)

Part 2)

For the single slit...

y/L = m(wavelength)/a

.02/1.2 = 1(600 X 10^-9)/a

a = 3.6 X 10^-5 m (which is 36 um)

IF IT WERE A DOUBLE SLIT

y/L = (m)(wavelength)/d

.03/1.2 = 1(600 X 10^-9)/d

d = 2.5 X 10^-5 m (which is 25 um)

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