"How do the CRT's RGB colour beams come into being?"

. Suppose you pass light from a laser through twoslits separated by 0.02 mm and find that the thirdbright line on a screen is formed at an angleof 16° relative to the incident beam. What is thewavelength of the light?

2) Light from glowing hydrogen contains many discrete spectral lines, of which two are Ha (hydrogen-alpha) and HB (hydrogen-beta), with wavelengths of 656.3 nm and 486.1 nm, respectively. Find the first-order angular separation between these wavelengths in a spectrometer that uses a grating with 6000 slits per cm.

(a) How far from some grains of red sand must you be so that you are just at the limit of resolving the grains if your pupil diameter is 3mm, the grains are spherical with radius 50μm, and the light from the gains has wavelength 650nm? (b) If the grains were blue and the light from them had wavelength 400nm instead, would the answer to (a) be larger or smaller? (c) Now let's say you are a superhero and you had x-ray vision, so you could see light that had a wavelength of 0.1nm instead. Now how far could you be from the gains of sand to just be at the limit to distinguish one grain of sand from another? (with the same pupil diameter). (assume you're on the beach and there's plenty of light from many frequencies bouncing off the sand, and when you turn on your x-ray vision you aren't bothered by all the other frequencies around).

If Superwoman had 0.12-nm wavelength x-ray vision and a 5.0-mm pupil diameter, at what maximum altitude could she distinguish villains from heroes assuming the minimum detail required is 4.8 cm?

need to check this,,

How is the coherence of light sources essential for holography?

In light microscopy, what effect does an Airy disk have on resolution?