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Chapter 27: Q37CQ (page 994)
What type of experimental evidence indicates that light is a wave?
We discover the nature of light with the help of phenomena of diffraction and interference.
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No light passes through two perfect polarizing filters with perpendicular axes. However, if a third polarizing filter is placed between the original two, some light can pass. Why is this? Under what circumstances does most of the light pass?
A telescope can be used to enlarge the diameter of a laser beam and limit difddfraction spreading. The laser beam is sent through the telescope in opposite the normal direction and can then be projected onto a satellite or the Moon.
(a) If this is done with the Mount Wilson telescope, producing a \(2.54 - m\) diameter beam of \(633 - nm\) light, what is the minimum angular spread of the beam?
(b) Neglecting atmospheric effects, what is the size of the spot this beam would make on the Moon, assuming a lunar distance of \(3.84 \times {10^8}{\rm{ }}m\)?
Suppose a feather appears green but has no green pigment. Explain in terms of diffraction.
Explain what happens to the energy carried by light that it is dimmed by passing it through two crossed polarizing filters.
(a) What is the smallest separation between two slits that will produce a second-order maximum for any visible light? (b) For all visible light?
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