10th Class Physical Science Chapter wise Important bit bank in English

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.