Light Reflection and Vision 4-PS4-2

Grade 4 - NGSS - CA

The retina cells that work in bright light, and help us see color

Cone cells

The retina cells that work in bright light, and help us see color, are cone cells. Cone cells in our eyes help us see different colors when it's bright outside.

Reflection of light at many angles by a rough surface

Diffuse reflection

Reflection of light at many angles by a rough surface. Diffuse reflection. Diffuse reflection happens when light hits a bumpy or uneven surface and scatters in many directions.

Electromagnetic energy that travels in waves, not all light is in the visible spectrum

Light

Electromagnetic energy that travels in waves, not all light is in the visible spectrum. Light is energy that we can see from sources like the sun or a lamp.

The opening at the center of the iris, through which light enters the eye

Pupil

The opening at the center of the iris, through which light enters the eye. Pupil. The pupil is the black circle in the middle of your eye that lets light inside so you can see.

The bouncing of light, sound, or heat waves off a surface

Reflection

The bouncing of light, sound, or heat waves off a surface. Reflection. Reflection is when light hits a surface and bounces back, like seeing yourself in a mirror.

The reflection that occurs when parallel light rays hit a smooth surface and every ray is reflected at the same angle

Regular reflection

The reflection that occurs when parallel light rays hit a smooth surface and every ray is reflected at the same angle is called regular reflection. Regular reflection happens when light bounces off a shiny, smooth surface like a mirror, making it easy to see a clear image.

The light-sensitive layer at the back of the eye, it contains rods and cones

Retina

The light-sensitive layer at the back of the eye, it contains rods and cones. Retina. The retina is like a camera's film that helps us see by turning light into signals for our brain.

A receptor cell in the retina that works in dim light, but cannot detect color

Rod

A receptor cell in the retina that works in dim light, but cannot detect color. Rods are special cells in the eye that help us see in low light but don't see colors well.