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Sebuah celah ganda disinari cahaya dengan panjang gelombang 720 nm. Sebuah layar diletakkan sejauh 150 cm dari celah ganda. Jika jarak kedua celah 0,18 mm, hitung jarak pita terang dan pita gelap berdekatan.

Sebuah celah ganda disinari cahaya dengan panjang gelombang 720 nm. Sebuah layar diletakkan sejauh 150 cm dari celah ganda. Jika jarak kedua celah 0,18 mm, hitung jarak pita terang dan pita gelap berdekatan.

Jawaban yang tepat untuk pertanyaan di atas adalah 3 mm.

Diketahui:
d = 0,18 mm = 1,8 x 10⁻⁴ m
λ = 720 nm = 7,2 x 10⁻⁷ m
L = 150 cm = 1 m
jarak pita teranf dan pita gelap berdekatan → m = 0,5
Ditanya: y = ?
Pembahasan:
Pada interferensi celah ganda, berkas cahaya yang melewati celah akan mengalami pelenturan muka gelombang, sehingga akan menimbulkan pola terang gelap pada layar. Jarak antara pola terang gelap tersebut dapat ditentukan dengan persamaan:
dy / L = mλ
dimana:
d = lebar celah (m)
y = jarak pola terang gelap (m)
L = jarak celah ke layar (m)
m = pola interferensi
λ = panjang gelombang

Sehingga:
y = mλL / d
y = (0,5 . 7,2 x 10⁻⁷ . 1,5) / 1,8 x 10⁻⁴
y = 3 x 10⁻³ m
y = 3 mm

Jadi, jarak pita terang dan pita gelap berdekatan adalah 3 mm.

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