Very short answer questions. 1. What is a convex lens?
2. What is the relationship between thickness of lens and focal length?
3. Define the following terms: center of curvature, principal axis, optic
focus and focal length.
4.
What is focusing?
5. What happens to the ray of light passing through the optical centre of a
6. What is the power of lens?
7. Define one diopter?
3. The magnification of lens is 1, less than 1 and more than 1? What does
2. What is defect of vision?
Short answer questions.