Finding out the focal length of the projection lens
A certain LCD projector includes a single thin lens. An object of 24.2 mm high is to be projected so that its image fills the screen 1.78 m high. The object-to-screen distance is 2.94 m.
(i) Find out the focal length of the projection lens.
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A certain LCD projector includes a single thin lens. An object of 24.2 mm high is to be projected so that its image fills the screen 1.78 m high. The object-to-screen distance is 2.94 m. (i) Find out the focal length of the projection lens.
By taking 10.0 mL of the unknown a student does a standard addition experiment, adding different volumes of the Fe(II) standard, adding the appropriate reagents and diluting to the mark in a 50.0mL volumetric flask.
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Explain what volume of 0.500 M CaCl2 solutions is required to prepare the 250 mL of solution that has a chloride concentration of 0.100 M?
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