Physics Wave Optics

A beam of unpolarized light of intensity I? is incident on a polaroid A. Then it is passed through another polaroid B. If the intensity of the emergent light is 18% of the original unpolarized light then find the angle (nearest integer in degree) between the principal plane of polaroid A and B.

In a young's double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If the screen is moved 8 cm towards the slits, the change in fringe width is 4 * 10^-5 m. If the separation between the slits is 1 mm, find the wavelength of light used (in nm ).

A monochromatic light of wavelength 6500 Å is used in YDSE. Now both slits are covered by two thin slab of refractive index 3.2 and 2.7 respectively. By doing so central bright fringe shifts to original 7^th bright fringe. If both slabs have same thickness then thickness of slab is $\left(in\mu m\right).$  

In Young's double slit experiment, the wavelength of red light is 7800 Å and that of blue light is 5200 Å. minimum value of n for which n^th bright band due to red light coincides with (n + 1)^th bright band due to blue light, is:

A parallel beam of monochromatic light is incident on a narrow rectangular slit of width 1mm. When the diffraction pattern in seen on a screen placed at a distance of 2m, the width of principal maxima is found to be 2.5mm. The wavelength of light is

Light of wavelength $\lambda$ in air enters a medium of refractive index $\mu$ . Two points in this medium, lying along the path of this light are at a distance $x$  apart. The phase difference between these points is:

If the intensity of light in double slit experiment from slit 1 and slit 2 are I₀ and 25I₀ respectively, find the ratio of intensities of light at minima and maxima in the interference pattern.

An unpolarized light beam is incident on the polarizes of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by 30° in clockwise direction, the intensity of emerging light will be________ Lumens.

In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.

The two light beams having intensities I and 9l interfere to produce a fringe pattern on a screen. The phase difference between the beams is /2 at point P and at point Q. Then the difference between the resultant intensities at P and Q will be: