Tolong bantu besok dikumpul, makasih sebelumnya.... Question from @Anandairsyah

December 2018 2 33 Report

Tolong bantu besok dikumpul, makasih sebelumnya

Mujee Diketahui
Sn = 25 cm
Pob = 250 D
fob = 100/250 = 0,4 cm
Pok = 50 D
fok = 100/50 = 2 cm
Sob = 0,6 cm
Ditanya
M = ----------? (Mata tidak berakomodasi)
Jawab:

Sob' = (Sob x fob)/(s - fob)
   = (0,6 x 0,4)/(0,6 - 0,4)
   = (0,6 x 0,4)/0,2
   = 0,6 x 2
   = 1,2

Untuk mata tidak berakomodasi:

M = (Sob'/Sob) x (Sn/fok)
   = (1,2/0,6)(25/2)
   = 25 x

Jadi perbesaran mikrosof 25 x

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rirismaulidina $sn=25~cm\\P_{obj}=250~dioptri\\P_{okl}=50~dioptri\\sob=0,6~cm\\\\f= \frac{100}{P}\\\\fob= \frac{100}{250}=0,4~cm\\\\fok= \frac{100}{50}=2~cm\\\\ \frac{1}{fob}= \frac{1}{sob} + \frac{1}{s'ob}\\\\ \frac{1}{0,4} = \frac{1}{0,6} + \frac{1}{s'ob} \\\\ \frac{1}{s'ob}= \frac{1}{0,4}- \frac{1}{0,6} \\\\s'ob= \frac{0,4 \times 0,6}{0,6-0,4}\\\\s'ob=1,2~cm\\\\M=| \frac{s'ob}{sob} \cdot \frac{sn}{fok} | \\\\M=| \frac{1,2}{0,6} \cdot \frac{25}{2} |\\\\M=25~kali$

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