Light Travels Along a Straight Line Light travels along a straight line from the source to the observer. This means that the path taken by the light is perp...
Light Travels Along a Straight Line
Light travels along a straight line from the source to the observer. This means that the path taken by the light is perpendicular to the line of sight, and that the light travels at a constant speed in a vacuum.
Properties of Light:
Light is a wave, meaning that it can be described by a wave equation.
The speed of light in a vacuum is constant, and it is equal to 3 * 10^8 m/s.
Light can travel through various mediums, including air, water, and glass.
The Law of Reflection:
The law of reflection states that when light rays strike a surface, they will reflect back in the same direction as they came from. This is because the wavefronts of the light waves are perpendicular to the surface.
The Law of Refraction:
The law of refraction states that when light rays pass from a medium with a higher refractive index (such as water) to a medium with a lower refractive index (such as air), they will bend towards the normal. This is because the denser medium has a greater density, which causes the light to bend towards the surface.
Examples:
The sun's light travels along a straight line from the Sun to Earth.
A beam of light from a lamp follows a straight line from the lamp to the eye.
When a ray of light strikes a window, it reflects back into the room.
Light from a light bulb travels along a straight line from the bulb to the observer's eye