True or false about lenses

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   A convex lens converges light rays.

2. Statement is true

   No

   Statement

   A concave lens has positive power.

3. Statement is true

   Yes

   Statement

   The refractive index of water is 1.33.

4. Statement is true

   No

   Statement

   A lens has three spherical surfaces.

5. Statement is true

   Yes

   Statement

   Power is the reciprocal of focal length.

6. Statement is true

   Yes

   Statement

   The unit of power is the dioptre.

Instructions

Decide whether each statement is true or false.

Explanation