Question

How far should an object be placed from a .convex lens of focal length 20 cm to obtain its image at a distance of 30 cm from the lens? What will be the height of the image if the object is 6 cm tall?

Answer 1

Answer:

We know from the question that

f=20 , v=30, u=?

1/f= 1/v-1/u

Therefore, 1/20=1/30-1/u

1/20-1/30 = -1/u

3-2/60 =-1/u

1/60 =-1/u

u = -60cm

An object should be placed at distance 60 cm from the convex lens.

hì/hó = v/u

hi/6. = 30/-60

hi/6 = 1/-2

hi = -3cm

Height of image=3 cm

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Answer 2

Answer:

See the ATTACHMENT for the SOLUTION dear ❤