1. How far in front of a lens of 45 cm focal length must an object be placed if the image is to be
three times as big as the object?
(2)
2. Explain how a converging lens can be used to project an image over a large distance such as
in a cinema. Explain why getting the image in focus can be difficult.
(3)
Answers: 1
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The difference between a red shift and a blue shift has to do with wavelength frequency. t or f
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An object's buoyant force and weight mean the same thing. a. trueb. false
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Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.
Answers: 3
1. How far in front of a lens of 45 cm focal length must an object be placed if the image is to be...
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