Hai teman,tolong bantu aku dong.. ☺...untukkk besokkk.. thanks.kalo dpat dua2ny,klo ngakkk dpat 1 aj.... Question from @alarsimaharani

October 2018 1 26 Report

Hai teman,tolong bantu aku dong..
☺...untukkk besokkk..
thanks.kalo dpat dua2ny,klo ngakkk dpat 1 aja....

izharulhaq78 $1.$
$f=20cm \\ M=4\times \\ \\ s_o=? \\ s_i=? \\ \\ M=| \frac{s_i}{s_o}| \\ 4=\frac{s_i}{s_o} \\ 4s_o=s_i \\ \\ \frac{1}{s_o}=\frac{1}{f}-\frac{1}{s_i} \\ \frac{1}{s_o}=\frac{1}{20}-\frac{1}{4s_o} \\ \frac{1}{s_o}+\frac{1}{4s_o}=\frac{1}{20} \\ \frac{4}{4s_o}+\frac{1}{4s_o}=\frac{1}{20} \\ \frac{5}{4s_o}=\frac{1}{20} \\ \frac{5}{s_o}=\frac{1}{5} \\ 5\times5=s_o \\ 25cm=s_o \\ \\ s_i=4s_o \\ s_i=4\times25 \\ s_i=100cm$

$2.$
$f=-7,5cm \\ s_o=5cm \\ h_o=1,5cm \\ \\ s_i=? \\ M=? \\ h_i=? \\ \\ \frac{1}{s_i}=\frac{1}{f}-\frac{1}{s_o} \\ \frac{1}{s_i}=-\frac{1}{7,5}-\frac{1}{5} \\ \frac{1}{s_i}=-\frac{2}{15}-\frac{3}{15} \\ \frac{1}{s_i}=-\frac{5}{15} \\ s_i}=-\frac{15}{5} \\ s_i}=-3cm$

$M=| \frac{s_i}{s_o}| \\ M=| \frac{-3}{5}| \\ M=\frac{3}{5} \\ M=0,6\times \\ \\ M= \frac{h_i}{h_o} \\ \frac{3}{5} = \frac{h_i}{1,5} \\ \frac{3}{1} = \frac{h_i}{0,3} \\ 3\times0,3=h_i \\ 0,9cm=h_i$

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