Optics Answers

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.

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)]

A laser printer uses a laser with a wavelength of 805nm. What should be the focal length of the lens to focus a collimated laser beam of a diameter of 5mm to obtain a printing resolution of 600 DPI (dots per inch)?

Two thin lenses are in contact and object is placed at 60cm from the lens. It forms a real image at a distance of 35cm from the lens. one of the lenses is converging with the focal.length of 20cm.complete or determine the nature and the total length of the second lens.

 Light is traveling through the two glass slabs as shown below.  

•  850 nm 

Nglass1 = 1.460 
Nglass2 = 1.430 

 (a) What could be the minimum incident angle if total internal reflection has to occur?      

 A beam of vertically polarized linear light is perpendicularly incident on an ideal linear polarizer. Show that if its transmission axis makes an angle of 60° with the vertical only 25% of the irradiance will be transmitted by the polarizer.