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1/N.sin α = n.lamda
1/4.10^6.sin (30) = 2.lamda
lamda = 6.250 amstrong (jawab : E)
No. 18
1/N.sin α = n.lamda
1/5.10^5.sin (30) = 2.lamda
lamda = 500 nm (jawab : D)
No. 19
(p.d)/L = n.lamda
(3.10^-4).(1,5.10^-3)/1 = 1.lamda
lamda = 4,5.10^-7 m (jawab : E)