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1/f = 1/s + 1/si
1/15= 1/25 + 1/si
1/15 - 1/25 = 1/si
25-15/375 = 1/si
10/375 = 1/si
375= 10si
37,5 = si (bayangan)
rumus perbesaran :
M= Si/So atau Hi/Ho
M= 37,5 / 25
M = 1,5
3) n1 sin1 = n2 sin2
n = indeks bias
sin 1 = sinar datang
sin 2 = sinar bias
1,33 . sin45 = 1,5 . sinx
1,33 . 1/2 akar 2 = 1,5 . sinx
2,66 = 1,5 .sin x
2,66 / 1,5 = sin x
1,773 = sin x
maaf kalau cuma bisa segini aja :)