Nonreflective coatings for camera lenses reduce the loss of light at various surfaces of multi-lens systems, as well as preventing internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride (n = 1.38) on
flint glass (n = 1.66) that will cause destructive interference of reflected light of wavelength l = 550 nm, a wavelength which is near the middle of the visual spectrum.
99.6 nm
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Which of the following composite materials could be recycled by melting the shredded composite and form recycled pellets with uniform properties?
(a) Epoxy matrix and carbon fibers (b) PP matrix and glass fibers (c) PP matrix and PP fibers (d) PP matrix and PE fibers
Extrasolar planets have been discovered with average densities similar to
A) styrofoam. B) iron. C) water. D) all of the above E) none of the above
A container is filled with water and the pressure at the container bottom is P. If the container is instead filled with oil having specific gravity 0.80, what new bottom pressure results?
a. a pressure < P b. the same pressure P c. a pressure > P d. This is unable to be determined with the information given.
A package is oscillating on a spring scale with a period of 4.60 s. At time t = 0.00 s the package has zero speed and is at x = 8.30 cm. At what time after t = 0.00 s will the package first be at x = 4.15 cm?
A) 0.575 s B) 0.767 s C) 1.15 s D) 1.30 s E) 1.53 s