Optics Answers

When light of an unknown polarization is examined with a polaroid it is found to exhibit maximum intensity (I )along y-axis and minimum intensity (2I/3) along x-axis.
The intensity transmitted through a polaroid with pass axis at 45°to y -axis (in x-y plane) is
1)5I/3
2)I/2
3)5I/6
4)I/4

A lightning flash dissipates an enormous amount of energy and is essentially instantaneous. How is the energy transformed into the sound waves of thunder?

A convex lens those two faces has the same radius of curvature has a focal length of 16cm, refractive index of the glass is 1.2. find the radius curvature

A rectangular glass block (n=1.52) is placed inside a clean water contained in a basin. A layer of oil (n=1.44) floats on the water surface. A ray of light from air strikes the oil surface at an angle of incidence of 28° . Calculate the angle of refraction at the water-glass interface. (refractive index of air =1.00)

A helium-neon laser diffraction-limited light beam of wavelength 600 nm and diameter 3×10⁻³m is directed towards the surface of the moon 375×10³ km away.
To calculate the diameter of light patch produced on the moon.

A beam of light is incident at an angle of teta on one face of an equilateral triangular prism made from a material of refractive index 1.6. At what angle of refraction in the prism will the emerging ray graze the opposite face ? What is the time used when the light’s frequency is 4.3 x 10^14 Hz

A body moving in a progressive wave pattern has acceleration of 10cm/s² when the displacement is 6cm and a speed of 12cm/s² when the displacement is 8cm. What is the amplitude of the wave?

In a Newton's ring experiment, the diameter of the 10th ring changes from 1.40 cm to 1.27 cm when a liquid is introduced between the lens and the plate. To calculate the refractive index of the liquid.

The coherence length for sodium D₂ line is 2.5cm. To deduce the coherence time and spectral width of the line. Given wavelength of D₂ line=6000 angstrom.

A transparent filen of glass of refractive index 1.5 is introduced normally in the path of one of the interfering beams of a Michelson interferometer which is illuminated with a light of wavelength 4800 angstrom. This causes 500 dark fringes to sweep across the field. To determine the thickness of the film.