A thin film of water of thickness 220nm is placed on top of a glass surface. What color will the film appear when viewed directly from the top? - Yellow  - Red - Green  -black  - Blue

3. If on a glass plate with refractive index 1.52, rests a soap bubble of thickness 742nm with n=1.33, what will be the colours seen on the soap bubble.

Green light (wavelength=550 nm) and blue light (wavelength=450 nm) strikes a diamond (ndiamond=2.42) at an angle of 23° from the normal to the air-diamond interface. What is the difference between the angles that each of the two rays refract?

2. (6 points) A predatory Angler Fish has evolved bioluminescence, so that it can make its own light that it uses like a flashlight to help see its prey. A species of jellyfish lives in deep ocean water (so that the only light that reaches it is the light produced by the angler fish). The index of refraction of water is 1.333. The body of the jellyfish is mostly water surrounded by a "thin film" of transparent cells with an index of refraction ncells = 1.19. If the body of the jellyfish is 0.5 μm thick, what color of light should the fish produce to be able to see the jellyfish? water water cells 2(1.50) (0.5X105 m) = (m+11) ~

Light originating in air is normally incident on a thin film of thickness 150nm with index of refraction n₁ = 1.5 that lies on top of a material with index of refraction n₂ = 1.2, as illustrated. nAir n1 n2 Determine the longest wavelength of light that is maximally reflected. O 450nm O 900nm O 600nm O 300nm

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