Question

Please explain it clearly:
At what distance from a concave lens of focal length 20cm , a 6 cm tall object be placed so as to obtain it's image at 15 cm from the lens? Also calculate the size of the image formed.Draw a diagram to justify your answer in about situation and label it.
For CBSE class 10 Students!✨​

Answer 1

Answer:

given = concave lens

           u = ?

           f = -20 cm

           v = -15 cm

to find object distance :-

1/f = 1/v -1/u

1/u = 1/v - 1/f

1/u = 1/(-15) - 1/(-20)

1/u = -1/15 + 1/20

1/u = -4+3/60

u = -60 cm

size :-

m = h'/h = v/u

h' = v/u * h

h' = -15/-60 * 6

h' = 6/4 cm

Answer 2

Answer:

The solution is in the attachment

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