Exam 35: Interference 1

An air wedge is formed from two glass plates which are in contact at their left edges.There are ten dark bands when viewed by reflection using monochromatic light.The left edge of the top plate is now slowly lifted until the plates are parallel.During this process:

A "wave front" is a surface of constant:

In a Young's double-slit experiment, the slit separation is doubled.This results in:

In an experiment to measure the wavelength of light using a double slit, it is found that the fringes are too close together to easily count them.To spread out the fringe pattern, one could:

Binoculars and microscopes are frequently made with coated optics by adding a thin layer of transparent material to the lens surface as shown, in order to improve light transmission.One wants:

One of the two slits in a Young's experiment is painted over so that it transmits only one-half the intensity of the other slit.As a result:

In a Michelson interferometer, in order to shift the pattern by half a fringe, one of the mirrors at the end of an arm must be moved by:

A monochromatic light source illuminates a double slit and the resulting interference pattern is observed on a distant screen.Let d be the center-to-center slit spacing, a the individual slit width, D the screen-to-slit distance, and ℓ the adjacent dark line spacing in the interference pattern.The wavelength of the light is then:

Two point sources, vibrating in phase, produce an interference pattern in a ripple tank.If the frequency is increased by 20%, the number of nodal lines:

In a Young's double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in phase by a multiple of:

The phase difference between the two waves which give rise to a dark spot in a Young's double-slit experiment is (where m = integer):

In a thin film experiment, a wedge of air is used between two glass plates.If the wavelength of the incident light in air is 480 nm, how much thicker is the air wedge at the 16th dark fringe than it is at the 6th?

The reason there are two slits, rather than one, in a Young's experiment is:

Units of "optical path length" are:

Waves from two slits are in phase at the slits and travel to a distant screen to produce the third bright fringe of the interference pattern.The difference in the distance traveled by the waves is:

A light wave with an electric field amplitude of E₀ and a phase constant of zero is to be combined with one of the following waves.Which of these combinations produces the greatest intensity?

A glass (n = 1.6)lens is coated with a thin film (n = 1.3)to reduce reflection of certain incident light.If $\lambda$ is the wavelength of the light in the film, the least film thickness is:

A liquid of refractive index n = 4/3 replaces the air between a fixed wedge formed from two glass plates as shown.As a result, the spacing between adjacent dark bands in the interference pattern:

A light wave with an electric field amplitude of 2E₀ and a phase constant of zero is to be combined with one of the following waves.Which of these combinations produces the least intensity?

To obtain an observable double-slit fringe pattern: