Question

an object of height 5 cm is placed in the front of a lens find the position,size and nature of the image if lens is- a.convex lens of focal length 15cm b. a concave lens of focal length 10 cm distance of object and lens is 10cm.​

Answer 1

Given, u=-20cm

f=10cm

v=?

We know

f1=v1−u1

101=v1−20(−1)

v1=202−1

v=20cm

We know

magnification (M)=hohi=u−v

or,−2020=−1=hohi since,h0=5cm

so,hi=−5cm

nature = real image