Wave Optics Tes...

A light has amplitude $$A$$ (after polariser) and angle between analyser and polariser is $$60^{\circ}$$. Light is reflected by analyser has amplitude

In Young's double slit experiment,A is the position of the third bright fringe on one side of central beright band.B is the $$ 13^{th} $$ bright fringes on the other side,as measured from A.If the wavelength of the light used is 4000 $$ A^o $$ then path difference for point B will be equal to:-

In a Young's doubble slit experiment, the ratio of the slit's width is $$ 4 : 1$$. The ratio of the intensity of maxima to minima, close to the central fringe on the screen, will be : 

The wavefronts of a light wave travelling in vacuum are given by x +y + z = c . the angle made by the direction of propogation of light with the X-axis is 

The figure shows a Ypung's double slit experimental setup. It is observed that when a thin transparent sheet of thickness $$t$$ and refractive index $$\mu$$ is put in front of one of the slits, the central maximum gets shifted by a distance equal to $$n$$ fringe widths. If the wavelength of light used is $$\lambda$$, $$t$$ will be

Oil floating on water looks coloured due to interference of light.What should be the order of magnitude of the thickness of the oil layer in order that this effect may be observed?

Monochromatic light is incident on a pair of narrow slits a distance of 0.1 mm apart. A series of
bright and dark fringes are observed on a screen a distance of 2.0m away. The distance between
adjacent bright fringes is 8.0 mm.
What is the path difference between the light waves from the two slits that meet at the second
order dark fringe?

In Young's double slit experiment, two wavelengths $$\lambda_1=780$$nm and $$\lambda_2=520$$nm are used to obtain interference fringes. If the $$n^{th}$$ bright band due to $$\lambda_1$$ coincides with $$(n+1)^{th}$$ bright band due to $$\lambda_2$$, then the value of n is?

In Young’s experiment for the interference of light, the separation between the silts is $$d$$ and the distance of the screen from the slits is $$D$$. If $$D$$ is increased by $$0.5\%$$ and $$d$$ is decreased by $$0.3\%$$, then for the light of a given wavelength, which one of the following is true?
“The fringe width........”

The unit of intensity of polarization is _______.