G4_L3_ Convex and concave lens

1. What is a lens?

• a. An opaque material

• b. A transparent glass or plastic with curved sides

• c. A tool for cutting paper

• d. A type of mirror

2. Why do lenses bend light rays?

• a. To make them disappear

• b. To change their color
  

• c. To redirect them as they pass through

• d. To slow them down

3. How are convex and concave lenses different?

• a. Convex lenses are always larger

• b. Concave lenses bend light towards the normal line

• c. Convex lenses have curved surfaces that bulge outwards

• d. Concave lenses slow down light rays

4. What is refraction?

• a. The process of redirecting light rays

• b. A type of reflection

• c. Light absorption

• d. Light emission

5. How do convex lenses refract light rays?

• a. By bending them towards the normal line

• b. By bending them away from the normal line

• c. By making them disappear

• d. By changing their direction

6. What happens to light rays after passing through a convex lens?

• a. They split into multiple colors

• b. They converge at a focal

• c. They become invisible

• d. They diverge away from each other

7. In concave lenses, how do light rays behave after refraction?

• a. They converge at a focal point

• b. They spee

• c. They bend towards the normal line

• d. They diverge away from each other

8. What is the focal length of a lens?

• a. The thickness of the lens

• b. The distance from the lens to the object

• c. The distance from the center of the lens to the focal point

• d. The color of the lens

9. What determines if an image will be smaller or larger than the original object?

• a. The focal length of the lens

• b. The distance between the lens and the object
  

• c. The thickness of the lens

• d. The type of material the lens is made of

10. How many main forms of lenses were discussed in the video?

• a. One

• b. Two

• c. Three

• d. Four