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Multiple Choice Test on Optics

Multiple Choice Test on Optics

Multiple Choice Test on Optics

Multiple Choice Test on Optics

Multiple Choice Test on Optics

Multiple Choice Test on Optics

1. The quantity is equal to:

2. One reason why the sky appears blue is because:

3. If μ 1 and phi 2 are solutions to the wave equation, which of the following is not also a solution, if a and b are real constants.

4. The direction of propagation of an electromagnetic wave is the same as:

5. Photons always propagate with speed c , but light appears to travel at a speed different from c in dense media. How can we account for this phenomenon?

6. 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 t/n i) with the normal to the interface.

7. The irradiance of a light ray is proportional to:

8. The phase velocity of the wave described by ψ = A sin(kx + σt + Π/2) is:

9. The period of the wave described by ψ = A cos(kx + σt + Π) is:

10. If we have electric and magnetic fields given by:


E = E 0cos(kz - σt)      
B = B 0cos(kz - σt)      

In SI units, what conditions need to be satisfied if these fields are to satisfy Maxwell's equations?

11. Which of the following functions of space and time defines a wave with speed v in the negative x direction?

12. The profile of a wave with equation ψ(x, t) = is equal to:

13. Maxwell's equations: I) predict the speed of an electromagnetic wave to be μ 0 ε 0 ; 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.

14. Which of the following is correct:

15. The wavelength of a photon with an energy of 3.6 eV is:

16. Which of the following would not be a good description of a photon:

17. A photon has a chance of being absorbed by an atom, only if:

18. Fermat's principle states that:

19. Light behaves in accordance with Fermat's principle because:

20. The Fresnel Equations: I) are a consequence of Maxwell's equations; II) imply a phase shift of 180 o 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.

21. Total internal reflection can occur:

22. The critical angle for an air-water interface (the index of refraction of water is n = 1.33 ) is about:

23. The spectrum observed when white light is shone through a prism is best explained by:

24. 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:

25. An expression for the absolute index of refraction is:

26. A light wave in air enters a substance in which light travels at 2.64×108 m/s at an angle of 48 o to the surface. The angle of refraction is:

27. Which of the following is a correct expression for the relative amplitude of a reflected ray (electric field perpendicular to the incident plane)?

28. Images formed by a convex mirror are:

29. For a concave mirror of focal length 5 centimeters, the image of an object placed 7 centimeters from the mirror will be:

30. 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?

31. 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?

32. What is the magnification of an image formed by an object 10 centimeters distant from a concave mirror of focal length 2 centimeters.

33. Concave mirrors can suffer from:

34. Concave lenses can suffer from:

35. Virtual images are so called because:

36. To form a diminished image with a convex lens, the object must be placed:

37. The radius of curvature of a convex mirror of focal length -8 centimeters is:

38. All images formed by diverging lenses are:

39. Which of the following is true for all lenses:

40. If x i 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:

41. Which of the following is not a consequence of interference effects?

42. In Young's Double Slit Experiment, increasing the wavelength of light will serve to:

43. In a Young's Double Slit interference pattern, the fourth maximum has an irradiance that is roughly:

44. 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:

45. 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 λ farther than light at the very edge of the slit. The point at which this light arrives on a distant screen will be:

46. If β = , the zeroes of irradiance for a single slit occur when:

47. Light reflecting from a dense medium is:

48. Randomly polarized light moving along the x axis in the positive x -direction is incident on an atomic oscillator at the origin. If you are at the point (0, y 0, 0) , you will observe:

49. A birefringent material is best described as:

50. 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: