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Chapter 25: Q27CQ (page 928)
Devise an arrangement of mirrors allowing you to see the back of your head. What is the minimum number of mirrors needed for this task?
The minimum number of mirrors required is two for this task.
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An optical fibre uses flint glass clad with crown glass. What is the critical angle?
On the Moon鈥檚 surface, lunar astronauts placed a corner reflector, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. What percent correction is needed to account for the delay in time due to the slowing of light in Earth鈥檚 atmosphere? Assume the distance to the Moon is precisely, and Earth鈥檚 atmosphere (which varies in density with altitude) is equivalent to a layer 30.0 kmthick with a constant index of refraction n=1.000293.
A beam of white light goes from air into water at an incident angle of\({75.0^ \circ }\). At what angles are the red (\(660{\rm{ }}nm\)) and violet (\(410{\rm{ }}nm\)) parts of the light refracted?
Under what circumstances will an image be located at the focal point of a lens or mirror?
In Example \(25.7\), the magnification of a book held \(7.50cm\) from a \(10.0cm\) focal length lens was found to be \(3.00\). (a) Find the magnification for the book when it is held \(8.50cm\) from the magnifier. (b) Do the same for when it is held \(9.50cm\) from the magnifier. (c) Comment on the trend in m as the object distance increases as in these two calculations.
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