Above the device is air which has index of refraction

Above the device is air which has index of
refraction, n
1
= 1. See the figure below.
#1 #2
(part 1 of 2) 10.0 points
A pair of narrow, parallel slits separated by
0 . 385 mm are illuminated by green light of
wavelength 553 nm. An interference pattern
is observed on a screen 1 . 05 m away from the
plane of the slits.
Calculate the distance from the central
maximum to the first bright region on ei-
ther side of the central maximum.
Determine the minimum film thickness that
Therefore, the required thickness is
t =
λ
4 n
2
=
593 nm
(4) (1 . 3)
= 114 . 038 nm .
Typically, such reflecting coatings reduce the
reflective loss from 30% (with no coating) to
10% (with coating), thereby increasing the
cell’s efficiency, since more light is available to
create carriers in the cell. In reality, the coat-
ing is never perfectly reflecting because the
required thickness is wavelength-dependent
and the incident light covers a wide range
of wavelengths. Glass lenses used in the cam-
eras and other optical instruments are usu-
ally coated with a transparent thin film, such
as magnesium fluoride (MgF
2
), to reduce or
eliminate unwanted reflection. More impor-
tant, such coatings enhance the transmission
of light through the lenses.
006 (part 1 of 2) 10.0 points
A pair of narrow, parallel slits separated by
0 . 385 mm are illuminated by green light of
wavelength 553 nm. An interference pattern
is observed on a screen 1 . 05 m away from the
plane of the slits.
Calculate the distance from the central
maximum to the first bright region on ei-
ther side of the central maximum.
produces the least reflection at a wavelength
of 593 nm.
2

Kapoor (mk9499) – oldhomework 35 – Turner – (60230) 4
Calculate the distance between the first and
second dark bands.
Determine the wavelength of the light. Be
sure to use the small angle approximation,
sin ( θ ) ≈ θ