Question

a 5cm tall object is placed perpendicular to principal axis of a convex lens of focal length 10cm. if the object is placed 30 cm away from the lens ,find the possition, size and nature of image

Answer 1

h=5cm
f=10cm
u=-30cm
$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$
1/v=1/10-1/30
1/v=(3-1)/30
1/v=2/30
v=15cm
$m = \frac{v}{u}$
m=-1/2
m=-0.5
size=2.5cm(ignoring-)
nature real inverted diminished