An optical instrument consist of a converging lens of focal lens 30cm, placed 20cm away from a diverging lens of focal lens 5cm. An object is placed 6m distance from the formal lens, calculate the position and magnification of the image form
1F=1F1+1F2−lF1F2,\frac 1F=\frac 1{F_1}+\frac 1{F_2}-\frac l{F_1F_2},F1=F11+F21−F1F2l,
F=30 cm,F=30~cm,F=30 cm,
f=dFd−F,f=\frac{dF}{d-F},f=d−FdF,
f=31.6 cm,f=31.6~cm,f=31.6 cm,
Γ=df,\Gamma=\frac df,Γ=fd,
Γ=19.\Gamma=19.Γ=19.
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