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.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Aracecar driver has to hold on tightly when going around a banked curve. approximately what is the centripetal force on a 2220.0 kg car going around a circle with a diameter of 190.0 meters at 25.0 m/s?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.