1. How are things transformed? Changes and interactions  Unit IV – Lesson 1 –Images made by mirrors and lenses and their purpose

2. Types of Mirrors  Mirrors come in two basic forms: convex and concave.  A convex mirror, reflects at a wider angle near its edged than its center, creating a slightly distorted image that’s smaller than actual size.  Concave mirrors curve inward, like a spoon (the side that holds soup).

3. Convex vs. Concave

4. Convex mirror

5. Convex Mirror  Convex mirrors have many uses, the smaller size of the images means that you can see more with these surfaces, hence their use in safety mirrors.

6. Concave mirror

7.  This mirrors have the ability to create an image when their curvature bounces light to a specific area in front of them, this area is called the focal point.

8. Non-reversing mirrors  Also known as true mirrors, were created by placing two mirrors perpendicular to each other.

9. Acoustic mirrors  Huge concrete dishes built to reflect and distribute sound instead of light.

10. Acoutic mirror

11. Two-way mirrors  These mirrors are made by coating one side of a sheet of glass with a very thi, very lightly reflective material. When the coated side faces a lighted room, some of the light reflects and some goes into a dark room behind the mirror, making it possible to see into the lighet room but not out.

12. Two way mirror

13. Refraction  Image formation by a lens epends upon the wave property called refraction.

14.  Energy’s transformation, importance and uses Unit IV –Lesson 2

15. Energy  Energy is the capacity to do work. The international measurement system for energy is the “International Measuring System”, which from its name in french, it’s abreviated SI.  The Joule, is the internationaly recognized unit for energy.

16. Energy  Any form of energy can be transformed into another form, the process of energy transformation is also known as energy coversion.

17. Energy Transformation  Energy doesn’t disappear, it just changes forms. Energy transformation is the process of changing energy from one form to another.

18. The main energy forms are:  Radiant (light) energy  Chemical energy  Mechanical energy  Nuclear energy  Electrical energy  Heat (thermal) energy  Sound energy

19. Energy Forms

20. Energy forms can be classified in two types:  Kinetic energy, which is motion energy.  Potential energy, which is stored energy.

21. Kinetic energy vs. Potential energy

22. Sound energy  Is a type of wave motion, sending molecules of air vibrating which produce sound.

23. Electrical Energy  Electrical energy is the moving electrical charges from one point to another in a conductor.

24. Nuclear Energy  Energy stored from the nucleus of an atom, that energy can be released when we combine or split the nucleus.

26. Thermal Energy  Total kinetic energy of atoms and molecules that are constantly in motion.

27. Radiant Energy  Energy made by electromagnetic waves that produce light.