Understanding Light and Reflection

How We See Objects

• We see objects because light waves bounce, or reflect, off them, and this is called reflection.
• First, light travels in a straight line from a source, then hits an object, and finally, the reflected light travels in a straight line from the object to our eye.
• The eye has special cells that can sense different colors of light, and this information is sent to the brain, allowing us to see.

Light and Reflection

• Light travels in straight lines and cannot pass through walls.
• When light hits a mirror, it strikes the mirror at an angle and reflects off of it at the same angle.
• This is why what we see in a mirror depends on where we stand.

Angle and Reflection

• An acute angle is less than 90°, and an obtuse angle is greater than 90°.
• When light rays are reflected into our eyes, we can see objects.

Periscope and Mirrors

• A periscope uses two mirrors to allow sailors to see what is on the surface of the ocean even when a submarine is underwater.
• The correct picture of a periscope shows how light travels to allow the sailor to see the ship.

Mirror and Reflection

• When we look at ourselves in a mirror, the light strikes the mirror at an angle and reflects off of it at the same angle.
• This is why what we see in a mirror depends on where we stand.

Questions and Answers

• We are able to see objects because light rays are reflected into our eyes.
• A person can see a red flower without using a mirror if they are standing in the right position.
• A person can see a red flower in the mirror if they are standing in the right position and the light reflects off the mirror at the correct angle.
• The source of light is not the eyes, but rather external sources such as the sun, flashlight, or robot.