2021-06-25

## How do you make an arrow illusion?

Directions:

1. Draw an arrow on a piece of paper with the marker. It can point left or right.
2. Pour water into a glass of water.
3. Slowly lower the paper with the arrow behind the glass.
4. Look through the glass and see the arrow pointing the other way!

## How does the arrow illusion work?

Draw two left-pointing arrows on a piece of paper and then put a clear, empty glass between you and those arrows. When the arrow is moved to a particular distance behind the glass, it looks like it reversed itself. When light passes from one material to another, it can bend or refract.

How do you make optical illusions with water?

When the light has to travel through a cylindrical glass, it bends to enter the glass of water, and bends again when it leaves the glass of water. Depending on the distance between the drawing and your glass, your image can turn completely around the vertical axis.

What do two arrows pointing away from each other mean?

Two arrows pointing in opposite directions: This often represents war or conflict, having to face two directions at once in an alert and vigilant defense. It might mean that someone is battling someone or something in their lives.

### How do you create refraction?

Instructions

1. Get a sheet of paper, and draw two arrows on it. One arrow near the top and one arrow near the bottom. Make the arrows point in the same direction.
2. Fill a glass with water.
3. Slowly lower the piece of paper behind the glass of water.
4. Look through the glass of water and watch what happens.

### Why do you think the straw was bent?

This is because the straw is not bending, but the light around the straw is bending due to refraction. Light refracts as it passes from one medium to the next because it travels at different speeds through those mediums. Light travels fastest through air, a little slower through water, and even slower through glass.

What happens when you put a straw in a glass of water?

Refraction causes the straw to look bent and sometimes it can even appears to be broken. Light usually travels in a straight line to our eyes, but when the light goes through the water, it slightly changes direction.