PASCO OS-8529 SLIT ACCESSORY - Manual (Page 10)

6
Slit Accessory 012–06348A
Questions
➀ Does the distance between maxima
increase, decrease, or stay the same
when the slit separation is
increased?
➁ Does the distance between maxima
increase, decrease, or stay the same
when the slit width is increased?
➂ Does the distance to the first
minima in the diffraction envelope
increase, decrease, or stay the same
when the slit separation is in-
creased?
➃
Does the distance to the first minima
in the diffraction envelope increase,
decrease, or stay the same when
the slit width is increased?
Slit-to-screen distance
(D) = _________________
Procedure
➀ Follow the setup procedure on page 2 of the manual using the
Multiple Slit Set with the 0.04/0.25 mm (slit width/separation)
double slit selected.
➁ Measure the distance from the slit to the screen and record.
➂ Turn off the room lights and mark the positions of the maxima in
the interference pattern on the screen.
➃ Turn on the room lights and measure the distance between the first
order (m = 1) marks and record this distance in Table 2.1. Also
measure the distance between the second order (m = 2) marks and
record in Table 2.1.
First Order (m = 1) Second Order (m = 2)
Distance between
side orders
Distance from center
to side (y)
Calculated slit
separation
% difference
Table 2.1: Data and Results for the 0.04/0.25 mm Double Slit
➄ Make a sketch of the interference pattern to scale.
➅ Change to a new double slit with the same slit width (0.04 mm) but
different slit separation (0.50 mm) and make a sketch to scale of this
new interference pattern.
➆
Change to another double slit with a slit width of 0.08 mm and the
original slit separation (0.25 mm) and make a sketch to scale of this
new interference pattern.
Analysis
➀ Divide the distances between side orders by two to get the distances
from the center of the pattern to the first and second order maxima.
Record these values of y in Table 2.1.
➁
Using the average wavelength of the laser (670 nm for the Diode
Laser), calculate the slit separation twice, once using first order and
once using second order. Record the results in Table 2.1.
➂
Calculate the percent differences between the experimental slit
separation and 0.25 mm. Record in Table 2.1.