Tóm tắt:
AB = h = 1cm
OF = OF' = f = 15cm
OA = d = 30cm
a) OA' = d' = ?
A'B' = h' = ?
Giải:
\(\Delta ABF\sim\Delta OIF\)
\(\Rightarrow\dfrac{AB}{OI}=\dfrac{AF}{OF}\Leftrightarrow\dfrac{AB}{A'B'}=\dfrac{OA-OF}{OF}\)
\(\Leftrightarrow\dfrac{1}{A'B'}=\dfrac{30-15}{15}\Rightarrow A'B'=1cm\)
\(\Delta OAB\sim\Delta OA'B'\)
\(\Rightarrow\dfrac{OA}{OA'}=\dfrac{AB}{A'B'}\Leftrightarrow\dfrac{30}{OA'}=\dfrac{1}{1}\Rightarrow OA'=30cm\)