PASCO OS-8529 SLIT ACCESSORY - Manual (Page 8)

4
Slit Accessory 012–06348A
First Order (m = 1) Second Order (m = 2)
Distance between
side orders
Distance from center
to side (y)
Calculated slit width
% difference
Procedure
➀ Follow the setup procedure on page 2 of the manual using the 0.04
mm slit of the Single Slit Set.
➁ Measure the distance from the slit to the screen and record.
➂ Turn off the room lights and mark the positions of the minima in
the diffraction pattern on the projection surface.
➃ Turn on the room lights and measure the distance between the
first order (m = 1) marks and record this
distance in Table 1.1. Also measure the distance between the
second order (m = 2) marks and record in
Table 1.1.
➄ Make a sketch of the diffraction pattern to scale.
➅ Change the slit width to 0.02 mm and 0.08 mm and make
sketches to scale of each of these diffraction patterns.
Slit-to-screen distance
(D) = _________________
Table 1.1: Data and Results for the 0.04 mm Single Slit
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 minima.
Record these values of y in Table 1.1.
➁
Using the average wavelength of the laser (670 nm for the Diode
Laser), calculate the slit width twice, once using first order and
once using second order. Record the results in Table 1.1.
➂
Calculate the percent differences between the experimental slit
widths and 0.04 mm. Record in Table 1.1.
Questions
➀ Does the distance between minima increase or decrease when the
slit width is increased?