Physics Textbook/Summary

• Light is a form of energy. It travels in straight lines.

• The speed of light is constant in a vacuum. It is approximately equal to 3.0 x 10⁸m/s.

• Light rays are regularly reflected by smooth, shiny surfaces. Images form on these surfaces. These are irregularly reflected by rough surfaces. No image forms on these surfaces.

• Light rays are refracted when they pass at an angle from one medium to another.

• Light travels in a less dense than in a denser medium.

• Sunlight separates into different colors, called the visible spectrum, as it passes through a prism. The spectrum consists of the colors of the rainbow: red, orange, yellow, green, blue, indigo, and violet.

• Dispersion is the separation of visible light into its different colors: red, orange, yellow, green, blue, indigo, and violet.

• Red, green, and blue (RGB) are the primary colors in light.

• When white light falls on an object which does not transmit light, one of the following happens:

• • all of the colors in white light are reflected: the object will appear light;

• • some of the colors may be reflected: the object appears colored; and

• • all the colors are absorbed by the object: the object appears black.

• The colors of opaque objects are the colors they reflect and which reaches our eyes. The colors of transparent materials are the colors they transmit.

FORCES

>>Newtons Second Law of Motion<< Equation : [F=ma], where 'a' sometimes can be used as 'G' which is equal to [9.8 m.s¯ ²]