shatakshimethi23

historical background HRM in Ethiopia

(1) An isoscelesright triangular prism is made ofcrown glass with a refractiveindex of n = nG = 1.520 for light ofwavelengthλ = λ0 = 500 nm in free space or air, assuming thattherefractive index of air is n0 = 1.0, so that the speed of light inair isexactly c = 299792458.0 m/s. A ray of green light is incidentat anangle of θ1 = 30.0° with respect to the normal to thelong sideof the prism, the first interface.

(a) Find thefrequency of green light waves, f.

(b) Find the periodof green light waves, T.

(c) Find the speedof green light in crown glass, v= vG.

(d) Find thewavelength of green light in crownglass, λG.

(e) Find the energyof green light photons, E.

(f) At the firstinterface, find the angle ofrefraction, θ2.

(g) At the secondinterface, one of the prism's twoshort sides,

find the angle ofincidence and reflection, θ3.

(h) At the thirdinterface, the other of the prism'stwo short sides,

find the angle ofincidence and reflection, θ4.

(i) At the fourthinterface, the prism's long side,find the angle ofincidence, θ5.

(j) At the fourthinterface, find the angle ofrefraction, θ6.

(k) Find thecritical angle for total internalreflection, θC.

(l) Find if there istotal internal reflection ateither the first or the secondinternal reflection.

(m) Describe the special propertyof right triangular prisms.

You will be utiizing a basicoptic system.

The index of refraction of theplastic cylindrical lens depends on wavelength. Choose an anglewhich gives a good color separation and measure the index ofrefraction for blue and red light.

If this question doesnt make sense..then just answer ittheoretically speaking. That is how would we go about checkingwhether or not it conforms with the n as the constant for thematerial... Thanks!

Background info:

ThePhysics

The Law ofReflection

The law of reflection states that for a plane mirror, the angle ofincidence is equal to the angle of reflection, and that the tworays lie in a plane.

r

normal

. A light ray perpendicular to the surface has an angle ofincidence 0°.

The Law of Refraction –Snell’s Law

A ray of light passing from one substance (index ofrefraction

n_{1)into another (index of refraction n}

2) across a plane boundary will be refracted. The angle the raymakes in one medium will be related to the angle in the secondmedium by the equation below, and that all rays lie in aplane.

(2)

Total InternalReflection

A ray incident on a medium with lower index of refraction willbe

totally internally reflected if sin θ1> n2/n1.There will be no transmitted beam for this incident angle. Ameasurement of the critical angle for total internalreflection can be used to determine the index of refraction of the substance.If n

2 = 1 (air), then the critical angle is:

sin θc = 1/

n

1. (3)

Polarization byReflection – Brewster’s Angle

If the angle between the reflected and refracted rays is 90°,then

tan θ

B = n2/n

1. (4)

At this angle, only light with polarization out of the plane ofreflection and refraction will be reflected. The reflected lightwill be completely polarized.

Figure3.

Figure2.

(1)

Always measure the angles with respect to the surface

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What defferent between science and commerce..

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When and where did HRM is said to be started in Ethiopia?