Important formulae & basic concepts Chapter: Ray Optics
λ is the wavelength of incident light 2 is the angle subtended by the diameter of objective lens at the focus of the microscope. β Fresnel distance is the distance beyond which spread of the beam due to diffraction is more than the size a of the slit is significant. a2 z= λ λ is the wavelength of incident light ‘a’ is the width of the slit
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