Very short pulses of high intensity laser beams are used to repair detached portions of the retina of the eye. The brief pulses of energy absorbed by the retina welds the detached portion back into place. In one such procedure, a laser beam has a wavelength of 810 nm and delivers 250 mW of power spread over a circular spot 510 micrometers in diameter. The vitreous humor (the transparent fluid that fills most of the eye) has an index of refraction of 1.34. (A) what average pressure would the pulse of the laser beam exert at normal incidence on a surface in air if the beam is fully absorbed? (B) what is the wavelength of the laser light inside the vitreous humor of the eye? (C) what is the frequency of the laser light inside the vitreous humor of the eye?

For each of the three sheets of polarizing material shown in the drawing, the orientation of the transmission axis is labeled relative to the vertical. The incident beam of light is unpolarized and has an intensity of 1190 W/m². What is the intensity of the beam transmitted through the three sheets when θ1 = 19.0°, θ2 = 66.5° and θ3 = 100.0° ?

The GPS (Global Positioning System) satellites are approximately 5.18 m across and transmit two low-power signals, one of which is at 1575.42 MHz (in the UHF band). In a series of laboratory tests on the satellite, you put two 1575.42 MHz UHF transmitters at opposite ends of the satellite. These broadcast in phase uniformly in all directions. You measure the intensity at points on a circle that is several hundred meters in radius and centered on the satellite. You measure angles on this circle relative to a point that lies along the centerline of the satellite (that is, the perpendicular bisector of a line which extends from one transmitter to the other). At this point on the circle, the measured intensity is 2.00 W/m². At how many other angles in the range 0° < 0 < 90° is the intensity also 2.00 W/m²? Express your answer as an integer. N = Submit Part B 0 = Submit 2 Find the four smallest (positive) angles in the range 0° < 0 < 90° for which the intensity is 2.00 W/m². Express your…

A microscope contains two polarizers, one below the stage to polarize the light and another polarizer (the analyzer) between the objective lens and the eyepiece. (a) White light with an intensity of 50 W/m2 is passed through the two polarizers in the microscope. If the analyzer is at an angle of 60° to the first polarizer. What is the intensity of light reaching the eyepiece? (b) The microscope is used to inspect a block of Si (n = 3.5) which is coated with a thin layer (t = 200 nm) of SiO (n = 1.45). What is the longest wavelength of light reflected strongly and thus not transmitted through the sample?

Unpolarized light passes through two Polaroid sheets. The transmission axis of the analyzer makes an angle of 35.2° with the axis of the polarizer. (a) What fraction of the original unpolarized light is transmitted through the analyzer? (Enter your answer to at least three decimal places.)(b) What fraction of the original light is absorbed by the analyzer?

Photons with a wavelength of 519 nm in air enter a plate of flint glass with index of refraction n = 1.66. Find the speed, wavelength, and energy of a photon in the glass. (a) speed (in m/s)  m/s (b) wavelength (in m)  m (c) energy (in J)

I am having trouble understanding this question, but I have a few guesses as to what the answer could be.  An ideal polarizing sheet transmits 90% of the incident partially polarized light.  The polarizing sheet is now rotated through 45 degrees; during the rotation process the transmitted light monotonically decreases in intensity. What fraction of the incident intensity now passes?   My guess is that the answer is between 0% and 50%, but I am not sure why.    Please advise, any clarification or answer would be useful! :)

A light beam is directed parallel to the axis of a hollow cylindrical tube. When the tube contains only air, it takes the light 8.72 ns to travel the length of the tube, but when the tube is filled with a transparent jelly, it takes the light 2.04 ns longer to travel its length. What is the refractive index of the jelly?   NOTE: The final answer should be 1.23.

Consider the dispersion curve for a material shown in the figure. If light with wavelengths A, B and C travel from the material into vacuum, which of the following is the correct relationship between their speeds in vacuum? 1.46 A B 1.45 1.44 850 1300 1550 Wavelength (nm) О А. А<С <В ов. А— В <С ос. В <С— А O D. A = B = C Index of Refraction

Unpolarized light passes through two Polaroid sheets. The transmission axis of the analyzer makes an angle of 20.9° with the axis of the polarizer. (a) What fraction of the original unpolarized light is transmitted through the analyzer? (Enter your answer to at least three decimal places.)(b) What fraction of the original light is absorbed by the analyzer?