7. A diffraction grating has a grating constant of 500 lines/mm. Light consisting of two discrete wavelengths (450 nm and 630 nm) is incident upon the grating and then a screen to view the maxima. a) What is the angular separation of the 1st order maxima considering the two wavelengths of light? b) At what distance away from the grating should the screen be placed such that the linear separation of the 1st order maxima is 3.00 cm?

A material having an index of refraction of 1.30 is used as an antireflective coating on a piece of glass (n = 1.50). What should be the minimum thickness of this film in order to minimize reflection of 480 nm light? nm Need Help? Read It

answer for the second two

A diffraction grating with n = 3.5E-05 lines/nm is used to separate two colors of light. The angle between their first maxima is Δθ ≡ θ1 - θ2 = 0.38 degrees, and the first light has wavelength λ1 = 629 nm. a) Find θ1 using n and λ1 in radians.  b) Find θ2 in radians.

33. You have a laser (a monochromatic light source) and want to estimate the wavelength. You decide to use a reflective diffraction grating to do this. The light is incident on the grating at 20 degrees with respect to normal. Using a grating with a groove distance of 5 um, the first-order diffraction, is found at an angle of -12.5 degrees. Determine the wavelength of the source. a) 500 nm b) 628 nm c) 808 nm d) 946 nm e) None of the above 34. In Raman spectrometry, Stokes lines have a) lower energy than that of anti-Stokes scattering. b) equal energy to that of anti-Stokes scattering. ) higher energy than that of anti-Stokes scattering d) none of the above 35. Upon ionization of phenol in aqueous solution, maximal UV absorbance changes to longer wavelength. a) True b) False 36. It takes longer time to observe fluorescence than phosphorescence. a) True b) False 37. The vibrational motion of C-H stretching in ethylene as in the figure can be detected by a) IR. b) Raman. c) IR and Raman.…

Some feathers of the ruby-throated hummingbird have an iridescent green color due to interference. A simplified model of the step structure of the feather is shown in the figure. If the strongest reflection for normal incidence is at ) = 530 nm, what is the step height h? Assume h has the smallest possible value. Air nm

Q1:a) Parallel rays of green mercury light with a wavelength of 546 nm pass through a slit covering a lens with a focal length of 60.0 cm. In the focal plane of the lens the distance from the central maximum to the first minimum is 10.2mm. What is the width of the slit? b) Unpolarized light of intensity 20 W /cm² is incident on two polarizing filters. The axis of the first filter is at an angle of 25.0° counterclockwise from the vertical and the axis of the second filter is at 62.0°counterclockwise from the vertical. What is the intensity of the light after it has passed through the second polarizer?

The lens of a telescope has a diameter of 25 cm. You are using it to look at two stars that are 2 × 10 17 m away from you and 6 × 10 9 m from each other. You are measuring light with a wavelength of 700 nm. As the light goes through the lens, it diffracts. a. Is it possible, using this telescope, to see the two stars as separate stars?  b. What is the minimum possible lens diameter you would need in order to resolve these two stars?