Optics Answers

Consider a step-index fiber for which n1 = 1.475, n2 = 1.460 and a = 25µm. What is the maximum value of θ for which the ray ill be guided by the fiber. 

Consider a step-index fiber for which n1 = 1.475, n2 = 1.460 and a = 25µm. What is the maximum value of θ for which the ray ill be guided by the fiber. 

 Consider a step-index fiber for which n1 = 1.475, n2 = 1.460 and a = 25µm. What is the maximum value of θ for which the ray ill be guided by the fiber. 

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The difference between the transmittance coefficients of the same substance measured in the same cuvette at different wavelengths is equal to 100 (T1/T2 ). How many times are the optical densities changed (D1-D2=1 ) ?.

two regions of the human body have a temperature at 37*c and 35*c respectively. how many times their radiant emittances differ?

a thin convex lens is examined in an optical bench. a screen is placed at a distance of 3.6m from an object. when the lens is placed in a place between the object and the screen, a sharp image twice the size of the object is obtained on the screen. how large is the focal length of the examined lens

The electric field vectors of two light waves propagating along the positive zdirection

are given as

E₁(z,t) = xˆ E₀₁cos(kz - (omega)t)

E₂(z,t) = yˆ E₀₂cos(kz-(omega)t + (si))

where xˆ and yˆ are unit vectors along x and y-axes, respectively. Show that when

these two waves superpose, we obtain elliptically polarised light. Also show that

the linear and circular polarisations are special cases of elliptical polarisation

Determine the frequencies of the fundamental mode and the next two harmonics

that can be set up on a sitar string of length 1.0 m. Take the speed of waves of the

string to be 2.8 *10³ms^-1.

Write a simulation program that calculates Fresnel and Rayleigh-Sommerfeld diffraction fields between

two parallel planes. There will be a main body and two functions in the simulation program. Each

function will perform one of the diffraction field calculation. Those functions should take sampling

period, size of the diffraction field, optical wavelength and the distance between planes as inputs from

the main body. As a test diffraction field, you can prepare a white circular region with 15 pixel radius in

a 256 * 256 black image. You can use following parameters to test your simulation programs: Sampling

period: Lemad/2; wavelength: 500nm; the distance between the planes: 128 Lemda.

Convex lens is illuminated by a plane wave which is propagating along z-axis. Sketch and nd out

mathematical expressions of wavefronts within each part of the optical system. Focus of both lenses are

f. The pattern t(x; y) is given as 1/2*[1+ cos(2x=10)]