step index fibre has core and cladding indices 1.466 and 1.460 respectively the fibre supports only one mode of propogation at wavelength 1200 nm and has normalized frequency equal to 2.405 find the acceptance angle if v>2.405 it signifies the radius of the fibre is critical angle for tir is the numerical aperture of fibre is

step index fibre has core and cladding indices 1.466 and 1.460 respectively the fibre supports only one mode of propogation at wavelength 1200 nm and has normalized frequency equal to 2.405 find the acceptance angle if v>2.405 it signifies the radius of the fibre is critical angle for tir is the numerical aperture of fibre is

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter4: Diffraction

Section: Chapter Questions

Problem 75P: The structure of the NaCl crystal forms reflecting planes 0.541 nm apart. What is the smallest...

See similar textbooks

Similar questions

A first-order Bragg reflection maximum is observed when a monochromatic X-ray falls on a crystal at a 32.3° angle to a reflecting plane. What is the wavelength of this X-ray?
On a certain crystal, a first-order X-ray diffraction maximum is observed at an angle of 27.1° relative to its surface, using an X-ray source of unknown wavelength. Additionally, when illuminated with a different, this time of known wavelength 0.137 nm, a second-order maximum is detected at 37.3°. Determine (a) the spacing between the reflecting planes, and (b) the unknown wavelength.
Check Your Understanding For the experiment in Example 4.4, show that m=20 is also a missing order.
The first-order Bragg angle for a certain crystal is 12.1°. What is the second-order angle?
What are the angular positions of the first and second minima in a diffraction pattern produced by a slit of width 0.20 mm that is illuminated by 400 nm light? What is the angular width of the central peak?
An X-ray scattering experiment is performed on a crystal whose atoms form planes separated by 0.440 nm. Using an X-ray source of wavelength 0.548 nm, what is the angle (with respect to the planes in question) at which the experimenter needs to illuminate the crystal in order to observe a first-order maximum?
When X-rays of wavelength lambada = 0.20nm are re-flected off the face of a crystal, a Bragg maximum is observed at a glancing angle theta= 17.5 degrees of with sufficient intensity that it is judged to be first order.(a)What is the spacing d of the planes that are paral-lel to the face in question? (b)What are the glancing angles of all higher order maxima?
If 680-nm light falls on a slit 0.0425 mm wide, what isthe angular width of the central diffraction peak?
A Fabry-Perot device contains two parallel part-reflective surfaces, each with a power reflection coefficient R = 0.9, separated by an air gap of 0.05 mm. The device is used at near-normal inci- dence with a transmission maximum at wavelength 600 nm. Calculate the coefficient of finesse, and the resolving power.
Solve the following, if the radio wave transmitted at an angle of incidence 68 degrees, with a wavelength of 6mm.I. Find the critical density II. Find Maximum usable frequency if Nmax = 2xN Critical
In a large vacuum chamber, monochromatic laserlight passes through a narrow slit in a thin aluminum plate and formsa diffraction pattern on a screen that is 0.500m from the slit. When thealuminum plate has a temperature of 20.0C, the width of the centralmaximum in the diffraction pattern is 2.75 mm. What is the change inthe width of the central maximum when the temperature of the plate israised to 520.0C? Does the width of the central diffraction maximumincrease or decrease when the temperature is increased?
Reflections from the {110} planes of barium titanate, BaTiO3, which has a tetragonal crystalline structure, were observed at glancing angles of 9.13° with Co Ka radiation of wavelength 179 pm. What is the value of the unit cell parameter a?