Question

an object , 4 cm high is placed at a distance of 10 cm from a convex lense of focal length 20.Find the position , nature and size of image.

Answer 1

h= 4 cm
u = -10 cm
f = 20 cm.
According to lens formula,,
1/v - 1/u = 1/f
1/v = 1/f + 1/u
1/v = 1/20 - 1/10
1/v = -1/20
v = -20
We have, m = v/u
                    = -20/-10 = 2
Also, m= h'/h  ( where h = height of object and h'= height of image)
2=h'/4
h' = 4X2 = 8cm.
Therefore, the image is real and inverted.

Answer 2

pls make my brain liest

real inverted and enlarged