A diffraction grating has rulings in its width. Determine its resolving power in first and second orders.
- - the total number of grating slits
- and - the resolving powers in the first and second order, respectively
How can we use the known expression for the resolving power in order to solve this problem?
Red light from a laser pointer shines directly on a narrow slit whose width is about 5 wavelengths of this light. A white screen is placed behind the slit. What is observed on the screen? Light that is more orange, because the wavelength shifts. Light that is closer to infrared, because the wavelength shifts. A tiny red rectangle. A red rectangle and dimmer red stripes on cither side of it. No light, because the slits are too narrow.