Investigation of the interference effects by Young's slit and diffraction by a diffraction grating Flashcards
1
Q
What precaution must be taken?
A
optical laser with output of 1mW or less
ensure it is not pointed directly into anyones eyes
use matt paper
2
Q
What should the conditions be in the lab?
A
partially darkened
3
Q
How is fringe seperation measured?
A
mark the visible fringes
count the fringes
central fringe is not included
use reuler to measure D
4
Q
how is slit separation measured?
A
with Vernier calipers
5
Q
What would the graph show?
A
w against D
should be a straight line through the origin
6
Q
what does the gradient of the graph show?
A
λ / s
