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Question 1 A blind is pulled down to cover a window but ithas a pinhole in it that is allowing sun to enter the room.

Question 1 A blind is pulled down to cover a window but ithas a pinhole in it that is allowing sun to enter the room. On a wall that is 2.50 m away you can see d circular diffraction pattern from the pinhole. The central maximum of this circular diffraction has a diameter of 1.20 cm. What is the diameter of the pinhole? (Hint: The average wavelength of sunlight is 550 nm.)

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