Rules for Ray Diagrams of Concave Lens

Q. The parallel rays of light after passing through a convex lens converge at:

1. Optical centre
2. Centre of curvature
3. Principal focus
4. Infinity

Q. Which one of the following materials cannot be used to make a lens?

1. glass
2. acrylic
3. water
4. clay

Q. A light ray passing through a spherical lens undergoes refractions.

1. two
2. one
3. four

Q. The parallel rays of light after passing through a convex lens converge at:

1. Principal focus
2. Infinity
3. Optical centre
4. Centre of curvature