In-phase for the grate spacing
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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The painter weighs 655 N and the ladder weighs 134N. Supposing no friction among the house and the upper end of the ladder, evaluate the force of friction which the driveway applies on the bottom of the ladder.
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Determine the focal length of a lens whose radius of curvatures are around 125 cm and 155 cm and whose thickness is around 2 cm and consists of an index of refraction of 1.5?
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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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