# The focal length of a concave mirror is 30 cm. If an object is placed 40 cm away from the mirror. Calculate the position and magnification of the image.

Given

The distance of the object from the mirror (u) = - 40cm (as the object is on the left side of mirror and acc. To our sign convention)

The focal length of the mirror (f) = -30 cm (Focal length is negative in case of the concave mirror.)

Image distance (v) = ?

Magnification (m) = ?

Formula Used

Using mirror formula

V = -120 (same side of mirror)

The image is real.

Magnification = = -3

Hence, the image is 3 times the object and image is inverted.

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