Question

A point object is placed at a distance of 25 cm from a convex mirror of focal length 25 cm. The image will form at ____________.

Options

• infinity

• focus

• pole

• 12.5 cm behind the mirror

Answer 1

A point object is placed at a distance of 25 cm from a convex mirror of focal length 25 cm. The image will form at 12.5 cm behind the mirror.

Explanation:

u = -25 cm, f = +25 cm

Using mirror formula

`1/"f" = 1/"v" + 1/"u"`

`therefore 1/25 = 1/"v" + 1/((-25))`

∴ v = 12.5 cm, behind tbe mirror