Antireflection Coating A glass lens ( n glass = 1 52) has an antirefiection coating of MgF 2 ( n = 1 38). (a) For 545-nm light, what minimum thickness of MgF 2 will cause the reflected rays R z and R 4 in Figure 28-50 to interfere destructively, assuming normal incidence? (b) Interference will also occur between the forward-moving rays R 1 and R 3 in Figure 28-50. What minimum thickness of MgF 2 will cause these two rays to interfere constructively? Incident light.
Antireflection Coating A glass lens ( n glass = 1 52) has an antirefiection coating of MgF 2 ( n = 1 38). (a) For 545-nm light, what minimum thickness of MgF 2 will cause the reflected rays R z and R 4 in Figure 28-50 to interfere destructively, assuming normal incidence? (b) Interference will also occur between the forward-moving rays R 1 and R 3 in Figure 28-50. What minimum thickness of MgF 2 will cause these two rays to interfere constructively? Incident light.
Antireflection Coating A glass lens (nglass = 1 52) has an antirefiection coating of MgF2(n = 1 38). (a) For 545-nm light, what minimum thickness of MgF2 will cause the reflected rays Rz and R4 in Figure 28-50 to interfere destructively, assuming normal incidence? (b) Interference will also occur between the forward-moving rays R1 and R3 in Figure 28-50. What minimum thickness of MgF2 will cause these two rays to interfere constructively? Incident light.
Answers with -1.828, -1.31 or 939.3 are not correct.
Three slits, each separated from its neighbor by d = 0.06 mm, are illuminated by a coherent light source of
wavelength 550 nm. The slits are extremely narrow. A screen is located L = 2.5 m from the slits. The
intensity on the centerline is 0.05 W. Consider a location on the screen x = 1.72 cm from the centerline.
a) Draw the phasors, according to the phasor model for the addition of harmonic waves, appropriate for this
location.
b) From the phasor diagram, calculate the intensity of light at this location.
A Jamin interferometer is a device for measuring or for comparing the indices of refraction of gases. A beam
of monochromatic light is split into two parts, each of which is directed along the axis of a separate cylindrical
tube before being recombined into a single beam that is viewed through a telescope. Suppose we are given the
following,
•
Length of each tube is L = 0.4 m.
• λ= 598 nm.
Both tubes are initially evacuated, and constructive interference is observed in the center of the field of view. As
air is slowly let into one of the tubes, the central field of view changes dark and back to bright a total of 198
times.
(a) What is the index of refraction for air?
(b) If the fringes can be counted to ±0.25 fringe, where one fringe is equivalent to one complete cycle of
intensity variation at the center of the field of view, to what accuracy can the index of refraction of air be
determined by this experiment?
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Diffraction of light animation best to understand class 12 physics; Author: PTAS: Physics Tomorrow Ambition School;https://www.youtube.com/watch?v=aYkd_xSvaxE;License: Standard YouTube License, CC-BY