2. In section 17.5, the textbook author develops an argument involving 2 points

Question

2. In section 17.5, the textbook author develops an argument involving 2 points within the slit. The key point in this argument is that:

A) There are six points that emit waves, but we only need to worry about these two points.

B) if light rays from any two points a/2 interfere destructively at a point on the screen, then there will be a dark band at that location

C) There are only two points that emit waves from a slit.

D) if light rays from any two points a/2 interfere constructively at a point on the screen, then there will be a bright band at that location

3. Which of these equations tells you the location of the peaks (bright lines) in the diffraction pattern?

A) There is no equation given for the locations of the bright lines

B) 17.19

C) 17.16

D) 17.20

E) 17.18

F) 17.17

4. If you double the wavelength, what happens to the separation of the diffraction pattern? If you double the slit width, what happens to the separation of the diffraction pattern?

A) Double : double separation; double slit width: double separation

B) Double : halve separation; double slit width: no change in separation

C) Double : double separation; double slit width: no change in separation

D) Double : double separation; double slit width: halve separation

E) Double : halve separation; double slit width: halve separation

F) Double : halve separation; double slit width: double separation

5. Rayleigh's criterion says that two objects are just barely resolved when

A) their diffraction patterns have completely overlapped

B) their diffraction patterns are completely separated

C) the objects have no diffraction patterns

D) the diffraction patterns are partially separated

6. The smallest detail observable is of order:

A) the frequency of light used to observe it

B) the focal length of the lens used

C) the wavelength of light used to observe it

D) the diameter of the lens (or aperture) used

Explanation / Answer

4. If you double the wavelength, what happens to the separation of the diffraction pattern? If you double the slit width

D) Double : double separation; double slit width: halve separation

since

w = saperation = D/d               where D = screen distance , d = slit width

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