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Chapter 35: Q93P (page 1079)
If the distance between the first and tenth minima of a double-slit pattern is 18.0 mm and the slits are separated by 0.150 mm with the screen 50.0 cm from the slits, what is the wavelength of the light used?
Thus, the wavelength of light is .
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The lens in a Newton鈥檚 rings experiment (see problem 75) has diameter 20 mm and radius of curvature . For in air, how many bright rings are produced with the setup (a) in air and
(b) immersed in water ?
Reflection by thin layers. In Fig. 35-42, light is incident perpendicularly on a thin layer of material 2 that lies between (thicker) materials 1 and 3. (The rays are tilted only for clarity.) The waves of rays and interfere, and here we consider the type of interference to be either maximum (max) or minimum (min). For this situation, each problem in Table 35- 2 refers to the indexes of refraction , , and , the type of interference, the thin-layer thickness in nanometres, and the wavelength 位 in nanometres of the light as measured in air. Where is missing, give the wavelength that is in the visible range. Where is missing, give the second least thickness or the third least thickness as indicated.
In a double-slit experiment, the distance between slits is and the slits are from the screen. Two interference patterns can be seen on the screen: one due to light of wavelength , and the other due to light of wavelength . What is the separation on the screen between the third-order bright fringes of the two interference patterns?
In Fig. 35-23, three pulses of light鈥� , , and 鈥攐f the same wavelength are sent through layers of plastic having the given indexes of refraction and along the paths indicated. Rank the pulses according to their travel time through the plastic layers, greatest first.
Figure 35-26 shows two rays of light, of wavelength 600nm, that reflectfrom glass surfaces separated by 150nm. The rays are initially in phase.
(a) What is the path length difference of the rays?
(b) When they have cleared the reflection region, are the rays exactly in phase, exactly out of phase, or in some intermediate state?
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