# Multiple Two Lens System with Diverging and Converging Lens | Summary and Q&A

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August 7, 2016
by
The Organic Chemistry Tutor
Multiple Two Lens System with Diverging and Converging Lens

## TL;DR

This video explains the concepts of a two-lens system, specifically a converging lens and a diverging lens, using equations and examples.

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### Q: How can the focal length of a converging lens be determined?

The focal length of a converging lens can be calculated using the thin lens equation, where f = 1 / (1 / f₁ + 1 / f₂), with f₁ and f₂ being the focal lengths of the two lenses.

### Q: What is the difference between a converging lens and a diverging lens?

A converging lens (also known as a convex lens) is thicker at the center and brings light rays together to form an image. On the other hand, a diverging lens (also known as a concave lens) is thinner at the center and spreads out light rays.

### Q: How is the position of the image determined?

The position of the image can be found using the thin lens equation, which involves the distances between the object and the lens, and between the image and the lens. The sign convention determines whether the image forms on the left or right side of the lens.

### Q: What does a negative magnification value indicate?

A negative magnification value indicates an inverted image, where the image is upside down compared to the object. A positive magnification value indicates an upright image.

## Summary & Key Takeaways

• The video discusses the equations and principles involved in a two-lens system, including the thin lens equation and magnification.

• It provides an example scenario with a converging lens and a diverging lens, where the distances and heights of the object and image are given.

• The video explains how to calculate the position, nature (real or virtual), orientation (upright or inverted), and size (enlarged or reduced) of the resulting images from each lens.