Optics Answers

State the three possible types of laser and their working principles.

A) a thin film of gasoline floats on a puddle of water.sun light falls almost perpendicularly on the film and reflects in to your eyes. although the sun light is white, since it contains all colors the film has a yellow hue because distractive interference has occurred eliminating the color of blue (wave length= 4.69 * 10^-7 m)from the reflected light. if the refractive index of gas and water are 1.4 and 1.33 determine the minimum thickness of the film.
B) A scuba diver 20 meters beneath the smooth surface of a clear lake looks upward and judges the sun to be 40 degree from directly overhead. at the same time a fisherman is in a boat directly above a diver.
1) at what angle from the vertical would the fisher man measure the sun?
2) if the fisherman looks downward at what depth below the surface would he judge the diver
to be ?
C) to help keep cool yourself in the summer or sunny day black colored umbrella shades have been used frequently what is your scientific justific

1.using scientific terminology (or using a manifestation of Rayeligh scattering of light) state
a)why the sky is blue
b) why the sunsets are reddish
c)why clouds appear white
2.state all the possibel properties of
a) all radiated electromagnetic waves and prove that speed of light is 3* 10^8 m/s
b)blackbody radiation

derive linear circular polarized light from the equation of an ellipse

derive equation of an ellipse for polarized light

what is the speed of light in a medium of refractive index 1.8

a beam of light strikes the side of a glass of water with an angle of incidence of 25 degrees, find the angle of refraction?

if a light ray enters a material like lens what do you think will happen to the ray?

is color spectrum polychromatic?