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### Images Formed by Lenses

• The main lens formula is

1/f = 1/p + 1/q

• f is the focal length, + if the lens is convex (converging), - if the lens is concave (diverging).
• p is the distance of object to lens, + if object is real, - if object is virtual
• q is the distance of image to lens, + if image is real, - if image is virtual.

### Images Formed by Lenses

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Converging Lenses: Real Objects
• Ray Going Through Center
• Converging Lens: Virtual Objects 18:30
• Reverse Path
• Virtual Object Real Image
• Diverging Lens 24:59
• Lens Summary 33:40
• Object, Lens, Image
• Object Distance to Lens
• Image Distance to Lens
• Focal Length
• Magnification
• Example: Converging Lens 38:07
• Q=50 cm Real Image
• Move Object 10 cm From the Lens
• Diverging Lens
• Extra Example 1: Converging Lens
• Extra Example 2: Diverging Lens
• Extra Example 3: Two Thing Converging Lenses
• Extra Example 4: Diverging Lens Final Image