Question

an object of hieght 6 cm is placed perpendicular to the principal axis of a concave lens of focal length 5 cm. use the lens formula to determine the position, size and nature of the image if the distance of the object from the lens is 10 cm

Answer 1

h=6cm

f= -5cm

u= -10cm

=>1/v=1/u+1/f

=1/-10+1/-5cm

=-1-2/10cm

=-3/10cm

=>v =-10/3cm

=-3.33cm

Hence,the image will form at the same side of object,3.33cm away from the lens

Now,m=h'/h=v/u

=h'/6=(-10/3)/-10

=h'/6=1/3

=h'=2 Ans

Hence the size of image is 2cm

nature of image is real and inverted