3. Reflection of light on different surfaces

1. A source of light, an opaque object and a screen are needed to form a ______.

2. Light travels in a ____________.

3. When light gets reflected from a surface, the angle of reflection is equal to the ___________.

4. The incident ray, the normal at the point of incidence and the __________ lie in the same plane.

5. Light also selects the path which takes the least time to travel. This principle was first given by ___________, a French lawyer and an amateur mathematician.

6. When light gets reflected from a surface, it selects the path that takes the ___________.

7. The plane in which the incident ray, ___________ and normal will lie is the plane of reflection.

8. The angle plays the role in sensing the _______ of the object.(The size of the object as angular size)

9. A light ray incident at an angle to the normal at the point of incidence will get reflected making the same angle with the _______.

10. In a concave mirror, all normal’s will converge towards a point. This point is called ____________ (C)of the mirror.

11. The midpoint (Geometrical center) of the mirror is called ________ (P)of the mirror.

12. The horizontal line which passes through the center of curvature and pole is called __________ (Or) ___________ of the mirror.

13. The distance between pole (p) and center of curvature (C) is __________ (R) of the mirror.

14. The rays coming from sun parallel to the concave mirror are converging at a point. This point is called ___________ (F) of the concave mirror.

15. The distance the pole to focal point of the mirror is called the ___________ (f) of the mirror.

16. The radius of curvature will be _______ of this distance (R=2f).

17. The image that we got by extending the rays backwards is called a __________.

18. The image that we cannot get this on a screen like a __________.

19. All distances should be measured from the _________ (p).

20. The distances measured in the direction of incident light, to be taken positive and measured in the opposite direction of incident light to be taken _________.

21. The mirror formula is 1/f = _________.

22. The image formed by a spherical mirror varies in size we refer to the _____________ ‘m’.

23. The story of ___________ that he burned ships using mirrors.

24. Light chooses the path which takes the ___________ to travel. It is also applicable to reflection of light.

25. Magnification, m = (or) m = _____________
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