Question

Ini no 11 gimana yaa kalo diketahui n dan f nyaa ?

Answer 1

Pembiasan
• Lens Maker Formula

nu = 1
na = 4/3
nl = 1,5
fu = 4 cm
fa = __?

Jarak fokus lensa
1/f = (nl/nmed -1) (1/R1 + 1/R2)
• di udara
1/fu = (nl/nu - 1) (1/R1 + 1/R2)
1/4 = (1,5 - 1) (1/R1 + 1/R2)
1/4 = (1/2) (1/R1 + 1/R2)

• di air
1/fa = (nl/na - 1) (1/R1 + 1/R2)
1/fa = (1,5/(4/3) - 1) (1/R1 + 1/R2)
1/fa = (9/8 - 1) (1/R1 + 1/R2)
1/fa = (1/8) (1/R1 + 1/R2)


Perbandingan untuk kedua keadaan
(1/4) / (1/fa) = (1/2) / (1/8)
fa/4 = 4
fa = 16 cm ← jwb