Question

10 May 2018 NAME: 5) 24 points. You are given a transmission grating (diffraction grating) with 5000 lines per centimeter and asked to find the separation distance between red and blue colors pro this grating. The transmission grating is to be illuminated with red light (-632.8 nm) and blue light (?-420.0 nm) at normal incidence. The point source of white light emits uniformly in all directions. The slit is illuminated by a point source of white light that is collimated by a thin plano-convex (PCX) lens having a clear aperture (opening) of 1 cm. The lens is located 2 cm from duced by the light source. Screen Grating (5000 lines/cm) m 2 red 1 meter a) What is the radius of curvature of this lens if its refractive index is 1.5? If the light source emits 100 Watts electromagnetic radiation, how much power is incident on the grating? (Iignore reflections at each optical surface) b)

Answer 1

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