Question

A diffraction grating has a slit distance of 3 μm. At what angle will purple light (405 nm) be seen in the 1^st order? At what angle will turquoise light (484 nm) be seen in the second order? If the light is projected on a screen 0.3 m away, how wide will the whole second order (400nm – 680nm) appear on the screen? What is the principle?

Answer 1

A diffraction grating has a slit distance of 3 um. At what angle will purple light (405 nm) be seen in the 1st order? At what angle will turquoise light (484 nm) be seen in the second order? If the light is projected on a screen 0.3 m away, how wide will the whole second order (400nm - 680nm) appear on the screen? What is the principle? na=dsino Purple light => m (405 x10-3) = 3 x106, Sino - 31120 =y0 = 7.760 i | X 405 X10-9 3x10-6 > 2x 484X10-9 3x106 sino Turquoise light -Yo = 18.84° X-74oonm, n=2 => 2x 400 Xi09 -Sino y o = 15.7° 3 x 10-6 >>680nm 11=2 = 27° = 2 2x680x109 =sino ay 3x10-6 width => tan o Y 0.3 =Y Y=0.072 11 któr z k & Bmx- => [w= 0.144 m "Principle is called diffraction