Question

an object of height 8cm is placed at the distance of 40cm infront of a convex lens of focal length 20cm .The size of images is a)12cm b) 4cm c)-8cm d)16cm​

Answer 1

Answer:

C)-8cm

Explanation:

h =8cm

f=20cm

u=-40cm

1/f=1/v-1/u

1/20=1/v-1/40

1/v=1/20-1/40

1/v=1/40

v= 40

v/u=h'/h

-1=h'/8

h'=-8cm