a beam of laser light of wavelength 632.8 nm has a circular cross section 2mm in diameter . A rectangular aperture is to be placed in the centre of the beam so that when the light falls on the wall 4.5m away the central maximum fills a rectangle 110mm wide and 6mm high. The dimension are measured between bracketing the central maximum . Find the required width and height of the aperture.

Mayank , 5 Years ago

Grade 12th Pass