Electromagnetics, Waves, and Optics

Practice Questions

GRE Subject Test: Physics › Electromagnetics, Waves, and Optics

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1

A beam of light travels through a medium with index of refraction until it reaches an interface with another material, with index of refraction . No light is transmitted into the second material. At what angle (measured from the plane of the interface between the two materials) does the beam hit the second material?

2

A beam of light, with wavelength , is normally incident on a transmission diffraction grating. With respect to the incident beam, the first order diffraction maximum occurs at an angle of . What is the number of slits per centimeter on the grating?

3

A car's horn has a frequency of . As the car drives away from you, you hear the horn at a frequency of . What is the speed of the car?

4

A candle tall is placed to the left of a thin convex lens with focal length . What is the height and orientation of the image created?

5

What is the total resistance of a circuit containing four resistors () hooked up in series.

6

A reflective sphere has a diameter of . The surface of the sphere makes a convex spherical mirror; what is its focal point?

7

What is the total resistance of a circuit containing four resistors () hooked up in series.

8

A beam of unpolarized light passes through two linear polarizers whose polarization axes are at an angle theta with each other. The light initially has an intensity , and has an intensity of after passing through both polarizes. Find ?

9

A reflective sphere has a diameter of . The surface of the sphere makes a convex spherical mirror; what is its focal point?

10

A beam of light travels through a medium with index of refraction until it reaches an interface with another material, with index of refraction . No light is transmitted into the second material. At what angle (measured from the plane of the interface between the two materials) does the beam hit the second material?

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