48. Light of wavelength 500 nm illuminates a round 0.50-mm diameter hole. A screen is placed 6.3 m behind the slit. What is the diameter of the central bright area on the screen?
(A) 15 mm
(B) 270 μm
(C) 7.7 mm
(D) 3800 μm
(E) 5 mm.
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統計: A(12), B(0), C(4), D(0), E(0) #3093889
統計: A(12), B(0), C(4), D(0), E(0) #3093889