A plane monochromatic light wave falls normally on an opaque half-plane. A screen is located at a distance `b = 100 cm` behind the half-plane. Making use of the cornu spiral (Fig.) find :
(a) the ratio of intensities of the first maximum and the neighbouring minimum,
(b) the wavelength of light if the first two maxima are separated by a distance `Deltax = 0.63mm`.

A plane monochromatic light wave falls normally on a diaphragm with two narrow slits separated by 2.5mm. The fringe pattern is formed on a screen 100 cm behind the diaphragm. By what distance will these fringes be displaced, when one of the slits is covered by a glass plate (mu = 1.5) of thickness 10 mu m ?

A plane monochromatic light wave falls normally on a diaphragm with two narrow slits separated by 2.5mm. The fringe pattern is formed on a screen 100 cm behind the diaphragm. By what distance will these fringes be displaced, when one of the slits is covered by a glass plate (mu = 1.5) of thickness 10 mu m ?

A plane monochromatic light wave with intensity I_(0) falls normally on an opaque screen with a round aperture. What is the intensity of light I behind the screen at the point for which the aperture (a) is equal to the first Fresnel zone, to the internal half of the first zone, (b) was made equal to the first Fresnel zone and then half of it was closed (along the diameter) ?

A plane monochromatic light falls normally on a diaphragm with two narrow slits separated by a distance d = 2.5 mm. A fringe pattern is formed on the screen placed at D = 100 cm behind the diaphragm. If one of the slits is covered by a glass plate of thickness 10mu m , then distance by which these fringes will be shifted will be :

Two slits are made on an opaque surface at a separation of 1mm beetween them. A screen in placed at a distance of 1m from the plane of slits. Find the separation between two consecutive maxima. Wavelength of light being used in the experiment is 500 nm.

A parallel beam of monochromatic light incidents on two parallel slits 0.02 mm apart forms fringes of 0.125 cm width at a distances of 80 cm from the plane of the slits. Find the wavelength of the monochormatic light.