A horizontal laser beam of wavelength 500 nm has a circular cross section. A rectangular aperture is to be placed in the

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A Horizontal Laser Beam Of Wavelength 500 Nm Has A Circular Cross Section A Rectangular Aperture Is To Be Placed In The 1 (417.73 KiB) Viewed 127 times

A horizontal laser beam of wavelength 500 nm has a circular cross section. A rectangular aperture is to be placed in the centre of the beam so that when the light falls perpendicularly on a wall 5.00 m away, the central maximum fills a rectangle 100 mm wide and 2.00 mm high. The dimensions are measured between the minima bracketing the central maximum. The size of the rectangular aperture is : (A) 0.025 mm high and 1.25 mm wide (B) 0.025 mm wide and 1.25 mm high (C) 0.05 mm high and 2.5 mm wide (D) 0.05 mm wide and 2.5 mm high