Question

An object of height 4cm is placed in front of aconvex lens of focal length 20cm.If the object distance is 40cm , find the nature, position and size of the image. Calculate the magnification

Answer 1

Answer:

Step-by-step explanation:

1/v-1/u= 1/f

1/v+1/40 = -1/20

1/v=-1/20-1/40

1/v=-60/800

1/v=-6/80

v=-40/3

magnification=v/u

-40/3/-20

2/3

hi/ho=2/3

hi=2ho/3

hi=2/3*4

hi=8/3

nature of image is virtual

upright