A thin layer of oil (n = 1.25) covers the surface of a puddle of water (n = 1.33). If light of wavelength 500 nm in vacuum is minimally reflected (film appears dark) from the oil surface, what is the minimum non-zero thickness of the oil? 500 nm 400 nm 300 nm 200 nm 100 nm O

A thin film of glycerin (n = 1.473) of thickness 536 nm with air on both sides is illuminated with white light at near normal incidence. What wavelengths will be strongly reflected in the range 300 nm to 700 nm? nm (smallest value) nm nm (largest value) Need Help? Read It

A thin layer of oil floats on a puddle of water. When sunlight hits the film from directly above, the colors red (650 nm) and violet (390 nm) are reflected. What is the minimum thickness of the oil? Use n=1.5 for the oil, and n=1.33 for water.

A diffraction grating with unknown number of lines per mm is illuminated by light at a wavelength = 633 nm and the first order diffraction pattern is seen at an angle B = 50.0°. Light of a second wavelength is shone onto the grating, whose second order diffraction pattern is seen at y = 60.0°. What is the wavelength of this second beam? 358 nm 392 nm 716 nm 548 nm 272 nm

A thin film of glycerin (n = 1.473) of thickness 475 nm with air on both sides is illuminated with white light at near normal incidence. What wavelengths will be strongly reflected in the range 300 nm to 700 nm? nm (smallest value) nm nm (largest value) Need Help? Read It

You are standing in air and are looking at a flat piece of glass (n = 1.52) on which there is a layer of transparent plastic (n = 1.61). Light whose wavelength is 640 nm in vacuum is incident nearly perpendicularly on the coated glass and reflects into your eyes. The layer of plastic looks dark. Find the smallest possible nonzero value for the thickness of the layer.

A thin film of glass (n = 1.66) of thickness 0.365 um is viewed under white light at near normal incidence. What wavelength of visible light is most strongly reflected by the film when surrounded by air? (Visible light ranges from 400 to 700 nm.) nm Additional Materials

A flat piece of glass is held stationary and horizontal above the highly polished, flat top end of a 12.0-cm-long vertical metal rod that has its lower end rigidly fixed. The thin film of air between the rod and glass is observed to be bright by reflected light when it is illuminated by light of wavelength 490 nm. As the temperature is slowly increased by 21.5°C, the film changes from bright to dark and back to bright 200 times. What is the coefficient of linear expansion of the metal? °C-1