Question

11. A concave lens of focal length 15
cm forms an image 10 cm from
the lens. How far is the object
placed from the lens? Draw the
ray diagram​

Answer 1

Answer:

use the formula 1/f = 1/u + 1/v

1/-15 = 1/-10+1/u

1/-15+1/10=1/u

u= 30 cm

Answer 2

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