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.

50 g of ice at 0°c is dropped in a beaker containing 100 g of water at 0°c. what will be the contents of the beaker after 5 hours? assume that the room temperature is 0°c.

Phase changes are chemical changes. true or false

How do the measurements of charge at the different locations on the sphere compare to each other? the charge measurements are different at all locations on the sphere. the charge measurements are virtually not the same at all locations on the sphere except for the charge at the very top and at the very bottom that are equal. the charge measurements are virtually the same at all locations on the sphere except for the charge at the very top. at the top, the conductive sphere has a small disk that is made of different material. the charge measurements are the same at all locations on the sphere. what happens to the charge on the conductive sphere when it is connected to a source of charge such as the electrostatic voltage source? nothing will happen because no charge goes around the surface of the sphere. the charge on the conductive sphere spreads out over the surface of the sphere; being greater in some specific locations on the sphere. the charge on the conductive sphere spreads out uniformly over the surface of the sphere. the charge on the conductive sphere spreads out non-uniformly over the surface of the sphere.