Lens Equations – Examples (Part 2)

# Lens Equations – Examples (Part 2)

Table of Contents

• Example 1
• Example 2
• What’s Next?

In the previous segment, we looked at some Examples based on the lens equation. In this segment, let us look at some more examples of the lens equation.

Fill Out the Form for Expert Academic Guidance!

+91

Live ClassesBooksTest SeriesSelf Learning

Verify OTP Code (required)

I agree to the terms and conditions and privacy policy.

## Example 1

Q. A concave lens has a focal length of 18 cm. At what distance from the lens should the object be placed so that it forms an image at 9 cm from the lens?

Solution:

Given:

Distance of the image from the lens (v) = -9 cm Focal length of the concave lens (f) = -18 cm To find:

Distance of the object from the lens (u)

Formula:

1 1 1

= −

? ? ?

Solution:

1 1 1

= −

? ? ?

1

∴ =

−18

1 1

−9 ?

1 1 1

∴ = +

? −9 18

## Related content

 Laws of Reflection of Light Laws of Reflection of Light (Experiment) RAR – Introduction to light Real and Virtual Images Plane Mirror – Image characteristics Plane Mirror – Ray Diagrams Spherical Mirrors Concave Mirror – Focal Point Concave Mirror – Image Characteristics Uses of a Convex Mirror