Question

Shaving mirror of radius of curvature 30 cm how far is Mirror from space magnification is equal to 2.5 CM

Answer 1

Heya buddy using this method you can solve...

Since it is a shaving mirror, the mirror is concave.

f = -30cm

u = -15cm

According to mirror formula,

1/f = 1/v + 1/u

1/(-30) = 1/v + 1(-15)

-1/30 = 1/v - 1/15

-1/30 + 1/15 = 1/v

(-1+2)/30 = 1/v

1/30 = v

v = 30cm.

The image position is 30cm

Magnification = -v/u = -(30)/-15 = 30/15 = 2

The image thus formed is virtual, erect and magnified.