Lens Equations – Examples (Part 1)

Table of Contents

• Example 1
• What’s Next?

In the previous segment, we learnt about The lens equation. In this segment, let us look at some examples of the lens equation.

Example 1

Q. A light bulb is placed at a distance of 10 cm from a convex lens having a focal length of 15 cm. Determine the distance of the image from the lens.

Given:

Distance of the object from the lens (u) = -10 cm Focal length of the convex lens (f) = 15 cm

To find:

Distance of the image from the lens (v)

Formula:

1 1 1

= −

? ? ?

Solution:

1 1 1

= −

? ? ?

1 1 1

∴ = +

15 ? 10

1 1 1

∴ = −

? 15 10