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is equal to:
One reason why the sky appears blue is because:
are solutions to the wave equation, which of the following is not also
a solution, if
are real constants.
The direction of propagation of an electromagnetic wave is the same as:
Photons always propagate with speed
, but light appears to travel at a speed different from
in dense media. How can we account for this phenomenon?
Which of the following is true: I) A reflected beam always has the same irradiance as the
incident beam; II) a reflected beam lies in the same plane as the incident beam; III) a reflected
beam always makes an angle
θ = sin-1(n
with the normal to the interface.
The irradiance of a light ray is proportional to:
The phase velocity of the wave described by
ψ = A sin(kx + σt + Π/2)
The period of the wave described by
ψ = A cos(kx + σt + Π)
If we have electric and magnetic fields given by:
Which of the following functions of space and time defines a wave with speed
in the negative
The profile of a wave with equation
ψ(x, t) =
is equal to:
Maxwell's equations: I) predict the speed of an electromagnetic wave to be
; II) imply that an
electric field changing in time will produce a magnetic field; III) impose boundary conditions that must be
satisfied at an interface between two media.
Which of the following is correct:
The wavelength of a photon with an energy of 3.6 eV is:
Which of the following would not be a good description of a photon:
A photon has a chance of being absorbed by an atom, only if:
Fermat's principle states that:
Light behaves in accordance with Fermat's principle because:
The Fresnel Equations: I) are a consequence of Maxwell's equations; II) imply a phase shift of 180
when light in vacuum with electric field perpendicular to the plane of incidence reflects from a surface; III) imply that polarization can be achi
eved by reflection.
Total internal reflection can occur:
The critical angle for an air-water interface (the index of refraction of water is
n = 1.33
) is about:
The spectrum observed when white light is shone through a prism is best explained by:
For a substance with natural frequencies in the infra-red range the color that will exhibit a higher index of refraction, and the type of dispersion are respectively:
An expression for the absolute index of refraction is:
A light wave in air enters a substance in which light travels at
m/s at an angle of 48
to the surface. The angle of refraction is:
Which of the following is a correct expression for the relative amplitude of a reflected ray (electric field perpendicular to the incident plane)?
Images formed by a convex mirror are:
For a concave mirror of focal length 5 centimeters, the image of an object placed 7 centimeters from the mirror will be:
A convex lens has a focal length of 3 centimeters. How far from the mirror is the object, if the image formed is 4 centimeters away?
What is the focal length of a plano-convex (planar on one side and convex on the other) lens made of glass with index of refraction
n = 1.40
and with the curved side having a radius of curvature of 20 centimeters?
What is the magnification of an image formed by an object 10 centimeters distant from a concave mirror of focal length 2 centimeters.
Concave mirrors can suffer from:
Concave lenses can suffer from:
Virtual images are so called because:
To form a diminished image with a convex lens, the object must be placed:
The radius of curvature of a convex mirror of focal length -8 centimeters is:
All images formed by diverging lenses are:
Which of the following is true for all lenses:
is the distance between the image and the focal point on the same side of the lens (for a convex lens), an alternate expression for the transverse magnification is:
Which of the following is not a consequence of interference effects?
In Young's Double Slit Experiment, increasing the wavelength of light will serve to:
In a Young's Double Slit interference pattern, the fourth maximum has an irradiance that is roughly:
If the finite width of the slits was taken into account, one would expect the fourth maximum of the double slit interference pattern to be:
For a single slit, light is heading in a direction such that rays from a point source in the middle of the slit travels exactly
farther than light at the very edge of the slit. The point at which this light arrives on a distant screen will be:
, the zeroes of irradiance for a single slit occur when:
Light reflecting from a dense medium is:
Randomly polarized light moving along the
axis in the positive
-direction is incident on an atomic oscillator at the origin. If you are at the point
, you will observe:
A birefringent material is best described as:
Light is propagating is a direction directly away from you, with an electric field that appears to be rotating in its orientation in the counterclockwise direction. The polarization state of such a wave is:
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