Final answer:
The information provided about the laser and CD involves calculating the groove spacing by using diffraction grating equations, but the original question about the distance between two walls cannot be answered due to a lack of complete information.
Step-by-step explanation:
The original question regarding the distance between the two parallel walls seems to be incomplete as crucial information such as the angles or additional measurements that would allow calculation of distance are missing. Therefore, an answer cannot be provided for that part of the question. However, I will address the question within the information given about the CD groove spacing based on the laser light phenomena described.
Fringe Pattern and Calculation of CD Groove Spacing
The observed fringes on the wall are a result of constructive and destructive interference of light. This interference pattern is created as the laser beam reflects off the grooves on a CD's surface, which effectively acts as a diffraction grating.
To calculate the groove spacing (d), we can use the formula for a first-order maximum in a diffraction grating:
d × sin(θ) = m × λ,
where d is the spacing between grooves, θ is the angle at which the first fringe occurs, m is the order of the maximum (in this case, m = 1 for the first fringe), and λ is the wavelength of the laser light.
To find the angle θ, we can use the geometry of the setup where the opposite side of the triangle (the distance from the central maximum to the first fringe) is 0.600 m, and the adjacent side (the distance from the CD to the wall) is 1.50 m. The angle can be found using the tangent function: tan(θ) = opposite/adjacent. The He-Ne laser commonly has a wavelength around 633 nm (or 633 × 10-9 m).
After finding the angle θ using the tangent function, plug this value and the wavelength into the diffraction grating equation to solve for d, the groove spacing on the CD.