Light and how we see colors

WHAT IS LIGHT : 

WHAT IS LIGHT We see light as color and brightness. It helps us to see objects by reflecting the light on objects reaches our eyes, we see objects. SUN AND STARS are the main sources of light.

Properties and Sources of Light : 

Properties and Sources of Light Light travels almost unimaginably fast and far. Light carries energy and information. Light travels in straight lines. Light bounces and bends when it comes in contact with objects. Light has color. Light has different intensities, it can be bright or dim.

Reflection and refraction : 

Reflection and refraction Objects that are in front of a mirror appear as if they are behind the mirror. This is because light rays are reflected by the mirror. Your brain perceives the light as if it always traveled in a straight line. When light moves through a material it travels in straight lines. When light rays travel from one material to another, the rays may reflect. The light that appears to bounce off the surface of an object is shown by a reflected ray. Another example of refraction of light is the twinkling of a star in the night sky As starlight travels from space into the Earth’s atmosphere, the rays are refracted.

Color and Vision : 

Color and Vision Key Question: How do we see color?

Color and Vision : 

Color and Vision When all the colors of the rainbow are combined, we do not see any particular color. We see light without any color. We call this combination of all the colors of light "white light".

Color and Vision : 

Color and Vision Blue light has a higher energy than green light, like the balls that make it into the top window. Red light has the lowest energy, like the balls that can only make it to the lowest window.

How the human eye sees color : 

How the human eye sees color The retina in the back of the eye contains photoreceptors. These receptors release chemical signals. Chemical signals travel to the brain along the optic nerve. optic nerve

Photoreceptors in the eye : 

Photoreceptors in the eye Cones respond to three colors: red, green and blue. Rods detect intensity of light: black, white, shades of gray.

How we see colors : 

How we see colors Which chemical signal gets sent depends on how much energy the light has. If the brain gets a signal from ONLY green cones, we see green.

How we see other colors : 

How we see other colors The three color receptors in the eye allow us to see millions of different colors. The additive primary colors are red, green, and blue.

FOR EX:- How does a color TV work? : 

FOR EX:- How does a color TV work? The screen is made of tiny red, green, and blue dots. The dots are called pixels and each pixel gives off its own light. TV sets can mix the three colors to get millions of different colors.

Slide 13: 

Efforts by PARAMJIT SANDHU CLASS 10TH A