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A cell phone of length 10.0cm sits 50.0cm in front of a lens of focal length 30.0cm.
a. Without equations, use a diagram to determine whether the image of the cell phone is real or virtual, upright or inverted, and magnified or reduced. Estimate the magnification from your diagram.
b. Now calculate the magnification and check it against your part (a) answer.
c. A student holds his eye close to the lens and looks through it at the cell phone. Instead of a sharp image, he sees a blur. Why?
d. Now the student backs up until his eye is 80cm from the lens. He sees a clear image, but it looks much bigger than he expected, give the answer to part (b). Why?
a hollow plastic sphere is held below the surface of a freshwater lake by a cord anchored to the bottom of the lake.
William Tell must split the apple atop his son's head from a distance of 20. At what angle must he aim it to hit the apple if the arrow travels at a speed of 36
The eardrum is displaced surprisingly little when a sound wave strikes it. Some idea of the displacement of the eardrum by a sound wave can be obtained by using Equation 7.1:The displacement amplitude, A, of the air molecules gives us a lower limi..
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