Determine the focal length and back focal length
A compound lens assembly consists of 2 lenses which are 5 cm apart with the focal lengths of a 135 cm and 275 cm. Determine the focal length and back focal length for this assembly?
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With a grating spacing of around 2250 nano-meters, a light wave length of 500 nano-meters, for orders 1 and 2, determine the corresponding angles which will be in-phase for this grate spacing?
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