Question

According to the new cartesian sign convention, the focal length of a convex lens is and focal length of a

concave lens is ______________________.

22. A concave mirror .......... rays of light, where as a convex mirror rays of light.

23. The dentists use .....mirrors to see large images of the teeth of patients.

24. A transparent material bound by two surfaces, of which one or both surfaces are spherical,forms a

_____________.

25. The degree of.. of light rays achieved bya lens is expressed in terms of its power​

Answer 1

Flat surface

22.have
23.concave lens
24.?
25.convex