BASIC TYPES OF

LENSES

​CONVEX LENS

​CONCAVE LENS

TYPE OF IMAGE

• Real or Virtual

• Enlarged or Reduced

• Erect or Inverted​

CONVEX AND CONCAVE LENS

CONVEX LENS

RAY DIAGRAM: CONVEX LENS

​WHEN THE OBJECT IS:

​WHEN THE IMAGE IS:

• Beyond 2F

• At 2F

• Between 2​F and F

• At F

• ​Between F and lens

• Between 2F and F

• At 2F

• Beyond 2F

• No image

• Virtual image​

SIGN CONVENTION

MAGNIFICATION

CONVEX AND CONCAVE LENS

​d_o + object distance

d_i + real image, other side of lens

d_i - virtual image, same side as object

h_i + erect image

h_i - inverted image​​

​

Note: When magnification is <0, the image is inverted.

​

CONCAVE LENS

​Note:

• Virtual image

• Reduced

• Upright image

​F

​F

​2F

​2F