Question

If a concave mirror is having a focal length of 18 cm and an object is placed at a distance of 10 cm then find the position of the image?

Answer 1

Answer:

22.5 cm

Explanation:

Given :

• Focal length of the concave mirror = - 18 cm (negative as concave)

• Distance at which the object is placed = - 10 cm (negative as concave)

To find :

• The position of the image

Mirror's formula says : 1/v + 1/u = 1/f

1/v - 1/10 = - 1/18

1/v = - 1/18+1/10

1/v = - 5/90 + 9/90

1/v = 4/90

v = 90/4

v = 22.5 cm

The position of the image is 22.5 cm away and the magnification is equal to 2.25