Question

3. An object of size 3 cm is placed at a distance of 15 cm from a convex lens of focal length 10 cm. Calculate the distance and size of the image so formed. What will be the nature of image?​

Answer 1

Answer:

pata nhi..................i think it should be 20

Answer 2

height of object= 3cm

object distance= -15cm

focal length= 10cm

v=?       h of image=?

1/f=1/v-1/u

1/v=1/f+1/u

1/v= 1/10+1/-15

1/v= -5/-150

v= -150/-5

v= 30cm

h of image= m*h of object

                 = v/u*h

                 = 30/-15*3

                 = -2*3

height of image = -6cm (-ve value because real and inverted)