Question

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

Answer 1

$\frac 1F=\frac 1{F_1}+\frac 1{F_2}-\frac l{F_1F_2},$

$F=30~cm,$

$f=\frac{dF}{d-F},$

$f=31.6~cm,$

$\Gamma=\frac df,$

$\Gamma=19.$