Phys 004, Section 2                                                            Apr 25, 2002

1. Which lens in a microscope has an angular magnification M ?
    A) eyepiece         B) objective         C) both         D) neither

2. In two-slit interference, the equation d sin θ_m = mλ gives the location of a
    A) bright fringe         B) dark fringe

3. Which of the two parameters, d for interference effects, or a for diffraction
    effects, is larger?
    A) a         B) d         C) either could be larger         D) both same size

4. Which causes a missing order ?
    A) interference max coincident with diffraction min
    B) diffraction max coincident with interference min
    C) interference max coincident with diffraction max
    D) interference min coincident with diffraction min

5. To change path-length difference between two paths to a phase difference,
    multiply the path-length difference by
    A) λ         B) k         C) 2π         D) π

6. When is there a phase change of π upon reflection at an interface?
    A) high to low         B) low to high         C) both cases         D) neither case

7. Which type of function is used in describing diffraction through a slit?
    A) sin² θ         B) [(sin x)/x]²         C) cos² θ         D) none of these

8. When measuring path lengths in a thin film, what wave length is used?
    A) λ₀         B) kλ ₀         C) λ₀/n         D) nλ ₀         E) kλ₀/n

9. Which has the more closely spaced maxima in a Young’s two-slit experiment?
    A) diffraction fringes         B) interference fringes         C) could be either

10. In a standard lens imaging system, a source point is imaged in the image as a
     A) point         B) line         C) disk         D) any of these

Answers: 1-a, 2-a, 3-b, 4-a, 5-b, 6-b, 7-b, 8-c, 9-b, 10-c

Last modified on April 25, 2002