Question

An Object of size 2 cm lies infront of a concave mirror of a focal lenght 10 cm at a distance 20 cm .what will be the size of image formed?

Answer 1

I am not sure about my answer

Answer 2

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Height of object = 2cm

Object distance = 15cm

Focal length = 10cm

1/f = 1/v +1/u

-1/10 = -1/15 +1/v

1/v = -3 +2 /30

v = -30 cm

Height of image/Height of object = -v /u

Height of image / 2 = 30/-15

Height of image = - 4cm

Nature - Real and inverted

Position - 30 cm from concave mirror

Size = 4 cm