A razor blade acting as a straight edge is illuminated by a collimated beam at
PHYSICS · Multi-part · Fermi University Physics · Optics & Photonics · Interference and diffraction · Interference and diffraction
What an Instrument Can See, Ch Scalar diffraction theory, derived
Problem
A razor blade acting as a straight edge is illuminated by a collimated beam at λ=532nm. Far from the edge on the illuminated side, the irradiance is I0=2.0Wm−2. A screen is placed a distance z behind the edge such that the Fresnel approximation is valid.
((a)) State the amplitude, relative to the unobstructed amplitude, at the point on the screen lying on the geometrical shadow boundary.
((b)) Hence find the irradiance at that point, in Wm−2.