# Physics Lesson 12.9.2 - Special Rays in Lenses

Welcome to our Physics lesson on Special Rays in Lenses, this is the second lesson of our suite of physics lessons covering the topic of Lenses. Equation of Lenses. Image Formation of Lenses, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.

## Special Rays in Lenses

Like in spherical mirrors, we have to use the special rays to build up the image in lenses. However, in this case, two special rays are enough to build the image. They are:

1. The ray that originates from the top of object, is incident to the lens in parallel to the principal axis and after refracting through lens, it passes through focus in converging lenses while in diverging lenses the extension passes through focus.
2. The ray that originates from the top of object, passes through the middle of lens (point O) then moves away without changing direction, as is normally incident to the lens surface.

The two special rays used in lenses are shown in the figure below.

You have reached the end of Physics lesson 12.9.2 Special Rays in Lenses. There are 8 lessons in this physics tutorial covering Lenses. Equation of Lenses. Image Formation of Lenses, you can access all the lessons from this tutorial below.

## More Lenses. Equation of Lenses. Image Formation of Lenses Lessons and Learning Resources

Optics Learning Material
Tutorial IDPhysics Tutorial TitleTutorialVideo
Tutorial
Revision
Notes
Revision
Questions
12.9Lenses. Equation of Lenses. Image Formation of Lenses
Lesson IDPhysics Lesson TitleLessonVideo
Lesson
12.9.1What Are Lenses? Types of Lenses
12.9.2Special Rays in Lenses
12.9.3Image Formation in Converging Lenses
12.9.4Image Formation in Diverging Lenses
12.9.5Equation of Lenses
12.9.6Magnification Produced by Lenses
12.9.7Aberration in Lenses
12.9.8Combined Systems of Lenses and Curved Mirrors

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