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Photography A 35-mm camera has a standard lens with focal length 50 mm and can focus on objects between 45 cm and infinity.
(a) Is the lens for such a camera a concave or a convex lens?
(b) The camera is focused by rotating the lens, which moves it on the camera body and changes its distance from the film. In what range of distances between the lens and the film plane must the lens move to focus properly over the 45 cm to infinity range?
A 2 cm long piece of Si with cross-sectional area of 0.1 cm2 is doped with donors of 1015 cm3, and has resistance of 90 ohms. Calculate the electron drift velocity
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a convex lens is held over a piece of paper outdoors on a sunny day. when the paper is held 21 below the lens the
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A small mirror is attached to a vertical wall, and it hangs adistance of 1.59 m above the floor. The mirror is facing dueeast, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The incident andrefle..
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a 40g clay ball going southeast at a 45 degree angle at 4m/s collides with a 30g clay ball moving to the west at 3.0 m/s. find the speed and direction of the resulting blob of clay
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