Vision and Light Key Concepts

Front

What is the role of light in vision?

Back

Light is necessary for animals to see objects; it must reach the object and then enter the eye.

Front

How long does an image last on the retina?

Back

The impression of an image on the retina lasts for 1/16th of a second.

Front

What is a variable in a scientific investigation?

Back

A variable is a factor that can be changed or controlled in an experiment to test its effects.

Front

What is a thaumatrope?

Back

A simple optical toy that creates the illusion of motion by combining two images.

Front

Where do light receptors in the eye send information?

Back

Light receptors send information to the brain.

Front

What is the function of the pupil in the eye?

Back

The pupil controls the amount of light that enters the eye.

Front

What are the two types of light receptors in the eye?

Back

Rods (for low light) and cones (for color vision).

Front

What is refraction?

Back

Refraction is the bending of light as it passes from one medium to another.

Front

What is the difference between reflection and refraction?

Back

Reflection is the bouncing back of light from a surface, while refraction is the bending of light.

Front

What is an optical illusion?

Back

An optical illusion is a visual perception that differs from reality.