PreLab – Wave Optics           Name:

 

1.     Referring to “Figure 3-An enlargement of the single slit shows the condition of the destructive interference of the light rays”, please select the correct relationship between q, a, and Ml.

(a)   tan q = Ml / a

(b)  tan q = a / Ml

(c)   cos q = Ml / a

(d)  sin q = Ml / a

(e)   sin q = a / Ml

 

2.    Referring to “Figure 2- The diffraction pattern for parallel light incident on a single slit projected on a distant screen”, please select the correct relationship between q, y, and D.

(a)   tan q = y / D

(b)  tan q = D / y

(c)   cos q = y / D

(d)  sin q = y / D

(e)   sin q = D / y

3.    What is the tangent of q, when q is 0.01100, rounded to the nearest 4 significant digits?  Note: q should be in radians.

4.    What is the sine of q, when q is 0.01100, rounded to the nearest 4 significant digits?  Note: q should be in radians.

5.    Which is the rule of thumb estimation between q, tan q, and sin q, when theta is less than 10°?  Note: q should be in radians.

(a)   sin q » ½ tan q

(b)  q/2 » tan q

(c)   q/2 » 2 sin q

(d)  q » sin q » tan q

(e)   2q » sin q » tan q

 
  1. Given Equation 3 in your lab manual, relating M, D, y, a, and l through q, what is the equation that estimates the wavelength?

 

 

 

 

  1. The wavelength of a He-Ne laser is ______ nm.
  1. For the given refraction pattern (Part A), what is the wavelength of this blue laser given the aperture of the diffraction grating is 40 microns, D is 1 meter for Part A, B, and C.      Given:   l » a y / MD? 

              

 
  1. In Part C of today’s lab, we also have a spiral helix where the average distance between minima, Dyave = l D / a.  What is the diameter of the wire, “a”, referencing above blue laser and what is the width of the spring given pitch is 2 mm?                                                              Given:  p = 2(w) tan(q/2)