6. Refraction of Light at Curved Surfaces

1. The line that joins the center of curvature and the pole is called ‘____________’.

2. The center of the sphere, of which curved surface is a part, is called as _______________ (C).

3. The ray that travels along the principal axis is ____________.

4. The ray that travels along the pole is _________.

5. The point where refracted ray intersects the axis in all the above cases is called the ____________.

6. If the rays move very close to the principal axis, the rays can be treated as parallel and are called __________ rays.

7. All distances are measured from the __________ (or optic center).

8. Distances measured along the direction of the incident light ray are taken as ____________.

9. Distances measured opposite to the direction of the incident light ray are taken as ___________.

10. The heights measured vertically above from the points on axis are taken as ____________.

11. The heights measured vertically down from points on axis are taken as __________.

12. The formula for formation of image in the case of a curved surfaces is – = ________

13. The formula for formation of image in the case of a plane mirror is – = _________

14. The lens is bounded by at least one ________ surface.

15. A lens may have two spherical surfaces bulging outwards. Such a lens is called _______________

16. The center of the sphere which contains the part of the curved surface is called _______________.

17. The distance between the center of curvature and curved surface is called _______________.

18. The midpoint of a thin lens is called ______________ of lens.

19. The point of convergence (or) the point from which rays seem to emanate is called _______________.

20. Every lens has _________ focal points.