Question

You have a tglass with an n=1.5 to the left of a tplastic with an n of 1.4, on the outside of either you have n=1. For a wavelength of 800 nm,

1. What is the 2nd thinnest tglass such that we see constructive interference?

2. What is the thinnest possible tplastic such that we get constructive interference.

Answer #1

you have a lens system that is to be used primarily for
675 nm red light.
Magnesium fluorite index of refraction = n =
1.38
Second thinnest coating of magnesium fluorite that would be
non-reflective for this wavelength = t = 366.8 nM
Assuming the index of refraction of the lens is bigger than
1.38.
Draw a diagram of the mediums showing where, if any, a
phase change occurs. State whether you are looking for constructive
of destructive interference.

What is the thinnest
film of oil which is floating on a puddle of water in
order to have constructive interference for reflected light of
wavelength 588. nm as seen from above the oil? The index of
refraction, n, for air is 1.00. The index of refraction, n, for oil
is 1.25. The index of refraction, n, for water is 1.33

Interference patterns do not have an infinite number of lines,
since there is a limit to how big can be.If you pass red light with
λ1= 670 nm wavelength through two slits separated by an unknown
distance, the highest order of constructive interference possible
is m1= 15. Show that the maximum value of m2 is 26, the highest
order of constructive interference possible when bluelight with λ2=
410 nm wavelength is used on same slits separated by same unknown
distance.

White light is shone on a very thin layer of glass (n =
1.5), and above the glass layer, interference maxima for two
wavelengths (and no other in between) are seen: one green
wavelength of 550 nm, and one orange wavelength of 610 nm. What is
the thickness of the glass layer?
1862 nm
1859 nm
1860 nm
1861 nm

An oil tank ship leaks crude oil (n = 1.2) in the ocean (n =
1.33), making a huge area of oil film. Please calculate: (1) For
top view from the airplane above the oil film with thickness of 600
nm, which wavelengths of visible light will have the highest
reflection (constructive interference for reflected light)? (2) For
bottom view from a diver inside the ocean below the same area,
which wavelengths of visible light will have the highest
transparency...

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...

You have a diffraction grating with 3000 lines/cm. You also have
a light source that emits light at 2 different wavelengths, 428 nm
and 707 nm, at the same time. The screen for your experiment is 1.5
meters from the diffraction grating.
A. What is the line spacing for the grating?
B. What is the difference in the angle of the 2nd bright fringe
for each wavelength for this grating?
C. Which wavelength is closer to the center of the...

1. Parallel light rays in air strike the surface of glass (n =
1.5) at an angle of incidence of 26o. Some of the rays
are reflected and some are refracted. What is the angle between
reflected and refracted rays?
2. A green laser (wavelength 545 nm) is shone from air to water.
Which of the following statements is true for the wavelength and
frequency of the laser light?
A. The wavelength will decrease but the frequency will remain
the...

(1)(A) You shine an orange laser (587 nm) on a double slit in an
experiment you perform in your physics lab. Measuring with a
protractor you see that the interference pattern makes the first
fringe at 11.0° with the horizontal. What is the separation between
the slits?
(B)What is the separation between two slits for which 650 nm
light has its first minimum at an angle of 31.5°?
(C)What is the wavelength of light falling on double slits
separated by...

Light with wavelength 700 nm travels through a vacuum (n=1). It is
normally incident upon a thin layer of oil (n=1.4), which rests
upon a thick layer of glass (n=1.5).
a) What
is the minimum thickness of oil needed to minimize the light
reflected from the oil?
b)
What is the minimum thickness of oil needed to maximize the
reflected light?

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