Conducting an experiment with a 534-nm wavelength green laser, a researcher notices a slight shift in the image generated and suspects the laser is unstable and switching between two closely spaced wavelengths, a phenomenon known as mode‑hopping. To determine if this is true, she decides to shine the laser on a double‑slit apparatus and look for changes in the pattern. Measuring to the first bright fringe on a screen 0.500 m away and using a slit separation of 80.0 μm, she measures a distance of 3.34 mm from the central maximum. When the laser shifts, so does the pattern, and she then measures the same fringe spacing to be 3.44 mm. What wavelength ? is the laser “hopping” to?

Fringes in the Thomas Young experiment are produced using sodium light of wavelength 495 nm and two slits which are 1.2 mm apart. If the fringes are formed on a screen 1.0 m away from the slits, how far is the third order bright fringe from the middle of the screen? Give your answer in millimeters (mm).

A hydrogen gas discharge lamp is used as a coherent light source illuminating NN slits in a barrier with a slit separation of 28 μmμm. The interference pattern is projected on a screen 2.00 m from the barrier. The first-order principal maxima to one side of the central maximum. The number of slits is sufficiently large that the individual lines are sharp and widely separated. Note that there are four different colors appearing in the source, violet is the color closest to the central maximum. λ=656λ=656 nm (red) λ=486λ=486 nm (cyan) λ=434λ=434 nm (blue-violet) λ=410λ=410 nm (violet) The blue-violet line is thin and somewhat faint, and it may be difficult to see without enlarging the figure. When viewing multiple orders of the interference pattern, the color sequence may change due to the interleaving of the different orders. 1. Using the values given in the problem statement, what is the distance along the screen, in centimeters, from the the central maximum to the first line?  2.…

A spacer is cut from a playing card of thickness 2.79 x 104 m and used to separate one end of two rectangular, optically flat, 2.80 cm long glass plates with n = 1.70, as in the figure below. Laser light at 543 nm shines straight down on the top plate. HINT Adjacent dark bands occur when the air gap thickness changes by half a wavelength. i Click the hint button again to remove this hint. (a) Count the number of phase reversals for the interfering waves. 1027 X (b) Calculate the separation (in m) between dark interference bands observed on the top plate. (No Response) m