Parallel laser beam ( = 550 nm) falls perpendicularly on the opaque screen that has a circular opening with diameter D = 2 mm. A dark spot is observed at a distance b = 18 cm on the central axis behind the screen. What is the minimal distance Ab that one has to move away from this spot and further away from the screen in order to observe a dark spot again?

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Parallel laser beam ( = 550 nm) falls perpendicularly
on the opaque screen that has a circular opening with
diameter D = 2 mm. A dark spot is observed at a
distance b = 18 cm on the central axis behind the
screen. What is the minimal distance Ab that one has to
move away from this spot and further away from the
screen in order to observe a dark spot again?
Transcribed Image Text:Parallel laser beam ( = 550 nm) falls perpendicularly on the opaque screen that has a circular opening with diameter D = 2 mm. A dark spot is observed at a distance b = 18 cm on the central axis behind the screen. What is the minimal distance Ab that one has to move away from this spot and further away from the screen in order to observe a dark spot again?
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