Exam 17: Wave Optics

Two sources of light illuminate a double slit simultaneously.One has wavelength 570 nm and the second has an unknown wavelength.The m = 5 bright fringe of the unknown wavelength overlaps the m = 4 bright fringe of the light of 570 nm wavelength.What is the unknown wavelength?

How many grating grooves are needed to resolve two spectral lines at λ = 351 nm separated by 0.59 nm in order m = 4?

A single slit forms a diffraction pattern with monochromatic light.The fourth minimum of the pattern occurs at an angle of 32° from the central maximum.The angle at which the fifth minimum of the pattern occurs is closest to:

Explain what you see when you squeeze your eyes almost shut while looking at a small light source far away in a dark room.

Visible light passes through a hole of diameter 150 nm in a sheet of metal and falls on a distant screen.If the metal is heated,making the hole larger,the size of the central bright spot on the screen gets smaller.

In a double slit interference pattern produced by light of wavelength λ,the dark spots occur at points for which the path difference between the light from the two slits is equal to mλ/2,where m = 1,2,3,....

What is the general rule for deciding whether we add amplitudes and then square to get the final intensity or first square each amplitude and add to get the final intensity?

A diffraction grating is described by its groove spacing d.But each groove consists of a clear aperture a and an opaque part b.For fixed d how does changing a and b (the ratio a/b)affect the diffracted light?

Situation 17.1 A 360 nm thick oil film floats on the surface of the water.The indices of refraction of the oil and the water are 1.50 and 1.33,respectively.The surface of the oil is illuminated from above at normal incidence with white light. -In Situation 17.1,the two wavelengths of light in the 400 nm to 800 nm wavelength band that are most strongly reflected,in nm,are closest to:

What is the difference between diffraction and interference?

Red and blue light pass through a double slit and fall on a distant screen.The bright spots of red light will be farther from the center than the blue bright spots.