Question

an object is placed at a distance 10 from a concave mirror of focal length 20 ? draw a ray diagram for the formation of image​

Answer 1

given, focal length of concave mirror, f = -20 cm

distance of object from the mirror, u = -10 cm

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

or, 1/v = 1/f - 1/u

or, 1/v = 1/-20 - 1/-10

or, 1/v = -1/20 + 1/10 = 1/20

or, v = +20cm

Answer 2

Hope it helped you

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