This document discusses refraction of light in lenses. It defines refraction as the bending of light when traveling between mediums of different densities. A lens is made of glass or plastic and refracts light rays, focusing them at a point. There are two main types of lenses: convex lenses are thicker in the center and form real or virtual images depending on the object's position, converging light at the focal point. Concave lenses are thicker at the edges and thinner in the center, forming upright and reduced images while diverging light at the focal point.

1. REFRACTION OF LIGHT IN
LENSES

2. REFRACTION
•IS THE BENDING OF LIGHT WHEN IT
TRAVELS FROM ONE MEDIUM TO
ANOTHER OF DIFFERENT OPTICAL
DENSITIES.

3. LENS
• IS A TRANSPARENT MATERIAL MADE OF
GLASS OR PLASTIC THAT REFRACTS LIGHT
RAYS AND FOCUSES (OR APPEAR TO
FOCUS THEM AT A POINT.

4. TYPES OF LENSES

5. CONVEX LENS
• IT IS THICKER IN THE CENTER THAN EDGES
• IT FORMS REAL IMAGES AND VIRTUAL IMAGES
DEPENDING ON POSITION OF THE OBJECT.
• IT IS ALSO CALLED CONVERGING LENS
BECAUSE THE LIGHT THAT PASSES THROUGH IT
TENDS TO CONVERGE AT A PATICULAR POINT
CALLED THE FOCAL POINT.

6. CONCAVE LENS
• IT IS THICKER AT EDGES AND THINNER IN THE
CENTER.
• IT FORMS UPRIGTH AND REDUCED IMAGES.
• IT IS ALSO CALLED DIVERGING LENS BECAUSE
THE LIGTH THAT PASSES THROUGH IT TENDS TO
DIVERGE AT A PARTICULAR POINT CALLED THE
FOCAL POINT.