Question

衍射光栅题目一光栅,宽为2.0cm,共有6000条缝,用589.3nm的光与光栅法线方向成30°角入射,共出现多少条明纹

Answer 1

光栅常数 d = 2.0/6000 cm

d*(sin30°+ sin90°) = + kλ

k = 2.0/6000 *(0.5+1)/(589.3*10^(-7)) = 8.48464

取整 k = 8

d*(sin30°-sin90°) = - k'λ

k' = - 2.0/6000 *(0.5-1)/(589.3*10^(-7)) = 2.82821

取整 k = 2

所以,一侧能看到8条,另一侧能看到2条,再加上0级,共能看到

8+2+1 = 11 条