Reflection - mirrors Mirrors (reflective devices)and Lenses refractive devices) are both"Aperturesand are similar to each other Law of reflection Mirror geometry given as a conic section rot surface z(p) k+1 k+1)P Reflected wave is also in the plane of incidence Specular Circle: k=0 Ellipse-1<k<0 Reflection Parabola: k=-1 Hyperbola: K<-1 SU mirror Detectors resolve Images produced by (solar)energy reflected from detector a target scene* in visual and nir rather than self-emissions Target Scene Chart: 5 February 13, 2001 16.684 Space Systems Product Development MIT Space Systems LaboratoryReflection-Mirrors Mirrors (Reflective Devices) and Lenses (Refractive Devices) are both “Apertures” and are similar to each other. Ti To Law of reflection: Ti=To Mirror Geometry given as a conic section rot surface: 1 2 z( )  U r  r  k 1 U  Reflected wave is also k 1 in the plane of incidence Circle: k=0 Ellipse -1<k<0 Specular Reflection Parabola: k=-1 Hyperbola: k<-1 Detectors resolve Images produced by (solar) energy reflected from a target scene* in Visual and NIR. *rather than self-emissions Target Scene sun mirror detector Chart: 5 16.684 Space Systems Product Development MIT Space Systems Laboratory February 13, 2001 2