Question

Interference with light We aim a red (620 nm) laser onto a small screen that has two slits that are 0.1 mm apart. Each slit has a width of 0.03 mm. The light coming out of the two slits is projected onto a big screen a distance X from the slits. In the photo on the right you can see the pattern that’s visible on the big screen. Using a ruler, we determine that the distance between two adjacent bright spots is equal to 12 mm.

[1 point] What can you say about the two slits? [ ] Since the pattern is horizontal, the slits are horizontal as well. [ ] Since the pattern is horizontal, the slits must be vertical. [ ] To obtain this pattern we must have one horizontal and one vertical slit. [ ] Not enough information is given to make any conclusion about the slits.

[5 points] Determine the distance X between the slits and the big screen. The red laser has a wavelength of 620 nm and its beam has a circular cross section with a diameter of 0.8 mm. The power rating of the laser “1.5 mW“ (i.e. 1.5 milliwatts) which we may assume is the power of the light coming out of the laser.

[4 points] Calculate how many photons are being emitted by the laser each second. When we aim the 620-nm laser on a special piece of glass, we find that none of the light is being reflected! That’s because the glass has been coated with a very thin layer of MgF2 which has a refractive index of 1.37, while the glass itself has a refractive index of 1.52. [5 points] Determine the minimum thickness of the MgF2 layer. Give your answer in nanometers.

Answer #1

We aim a red (620 nm) laser onto a small screen that has two
slits that are 0.1 mm apart. Each slit has a width of 0.03 mm. The
light coming out of the two slits is projected onto a big screen a
distance X from the slits. In the photo on the right you can see
the pattern that’s visible on the big screen. Using a ruler, we
determine that the distance between two adjacent bright spots is
equal...

A red Helium – neon laser with a wavelength of 632.8 nm
illuminates two narrow horizontal slits with
gap distance 0.200 mm A pattern of interference bands then
appears on a screen 1.00 m
from the slits
a) How far from the central maximum,
in both radians and millimetres on the screen, is first
minimum?
b) How far in
millimetres on the screen, is the fifth maximum from the central
maximum?
c) How big is the intensity in the...

Light from a laser with a wavelength of 5.60 ✕ 102 nm
is incident on (and perpendicular to) a pair of slits separated by
0.320 mm. An interference pattern is formed on a screen 1.90 m from
the slits. Find the distance (in mm) between the first and second
dark fringes of the interference pattern (in mm)?

You are given a visible laser of wavelength λ to study
interferences of light in the lab.
Consider the 5 situations below. Treat each question
independently
1.In air, you place a screen with two slits, separated by 0.86
mm, in front of the laser of wavelength 507.9 nm. You know that you
will see an interference pattern if you place an observation screen
some distance away. Determine what the distance between the plane
of the fringes and the observation screen...

A red He-Ne laser with a wavelength of 632.8 nm illuminates two
narrow horizontal slits with gap distance 0.200 mm. A pattern of
interference bands then appears on a screen 1.00m from the
columns.
a) How far from the central maximum, in both radians and
millimeters on the screen, is first minimum?
b) How far in millimeters on the screen, is the fifth maximum
from the central maximum?
c) How big is the intensity in the fifth maximum compared to...

A red laser from the physics lab is marked as producing 632.8-nm
light. When light from this laser falls on two closely spaced
slits, an interference pattern formed on a wall several meters away
has bright red fringes spaced 5.50 mm apart near the center of the
pattern. When the laser is replaced by a small laser pointer, the
fringes are 5.68 mm apart.
Part A
What is the wavelength of light produced by the pointer?
Express your answer to...

The
double-slit experiment has red light with wavelength at 500nm where
bright fringes are located 2 mm apart near the center of the
pattern screen on a large distance. 1. Drawgeometry slits and
viewing screen 2. What is the approximate expression for sinO in
terms of distance and location on the maxima screen? 3. When it is
done with green laser spacing is 6 mm. what is the wavelength? 4.
human can see 500 to 700 nm and if white...

Red light of wavelength 633 nm from a helium-neon laser passes
through a slit 0.350 mm wide. The diffraction pattern is observed
on a screen 2.55 m away. Define the width of a bright fringe as the
distance between the minima on either side.
a) What is the width of the central bright fringe?
b) What is the width of the first bright fringe on either side
of the central one?

Red light (wavelength 632.8 nm in air) from a Helium-Neon laser
is incident on a single slit of width 0.05 mm. The entire apparatus
is immersed in water of refractive index 1.333. Determine the
angular width of the central peak.

2-) A diffraction/interference pattern using a red helium-neon
laser as a light source is observed on a screen a distance of 1.20
m from the element(s) producing the pattern. Using positive values
to indicate distances to the right of the center of the pattern on
the observing screen and negative values for distances to the left
of the center, the following data is taken :
Maxima(Cm) Minima(cm)
-6.60 -6.10
-5.40 -4.75
-4.30 -3.60
-3.00 -2.35
-1.80 -1.20
+1.70 +1.15
+3.00...

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