For a demonstration, a professor uses a razor blade to cut a thin slit in a piec

Question

For a demonstration, a professor uses a razor blade to cut a thin slit in a piece of aluminum foil. When she shines a laser pointer (?=680nm) through the slit onto a screen 5.4m away, a diffraction pattern appears. The bright band in the center of the pattern is 8.0cm wide.

Part A

What is the width of the slit?

For a demonstration, a professor uses a razor blade to cut a thin slit in a piece of aluminum foil. When she shines a laser pointer (?=680nm) through the slit onto a screen 5.4m away, a diffraction pattern appears. The bright band in the center of the pattern is 8.0cm wide.

Part A

What is the width of the slit?

Explanation / Answer

birght band width, y = lamda*R/d

==> d = lamda*R/y

= 680*10^-9*5.4/0.08

= 4.59*10^-5 m

= 45.9 micro m

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