Question

Complete the following ray diagram :
h2o
15 cm-
- 30 cm
Find the nature, position and size of the image formed.
Use mirror formula to determine the magnification in this case. 2​

Answer 1

Thus the image will be formed at +30 cm. It is a real and upright image. The magnification is 2.

Explanation:

We are given that:

• Foca length "f" = 30 cm
• Distance of the image "u" = 15 cm

The size of the image can be determined by using the lens mirror formula.

The lens mirror formula is

1/f = 1/v + 1/u

1/v = 1/f - 1/u

1/v 1/30 - 1/15

1/v = 1/30

v = 30 cm

Thus the image will be formed at 30 cm

Magnification = I / O = v / u

Magnification = 30 /15 = 2