Determining Green Laser Wavelength using Diffraction Grid · RMPH 2012 #2
Physics · optics
Problem
Experimental Context: You have access to a ruler-screen (A) for observing spots of light, a T-shape ruler (B) serving as optical benchmark, laser pointers with red and green light (red wavelength is 650 nm), a wooden piece (C) supporting the diffraction grid, a wooden piece (D) for inserting the laser pointer, and wooden piece (E) supporting two "strange mirrors".
Task no. 2: Place the diffraction grid at d₁ = 30 cm and use green light.
2.a. Observe at least five spots on the ruler screen and write down their positions.
2.b. Determine the wavelength of the green light and specify the magnitude of the measuring error.
2.c. Change the distance to d₂ = 90 cm and observe at least three spots on the ruler screen, writing down their positions.
2.d. Determine the wavelength of the green light using these values and specify the magnitude of the measuring error.