Question

The focal length of concave mirror is 20 cm. An object
is placed at 30 cm from the pole of mirror then image
formed from the pole is
(options)
1) 15 cm
2) 20 cm
3) 60 cm
4) 30 cm​

Answer 1

Answer:

60 cm (3)

Explanation:

f = -20cm

u = -30cm

v = ?

mirror formula = 1/u+1/v = 1/f

                           1/v = 1/f-1/u

1/v = -1/20 - (-1/30)

        -1/20+1/30

        -3+2/60

        -1/60

v = -60 cm

so, the image will be formed at 60 cm from the pole....

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