## Is a straw in water a refraction?

When you add the water to the glass, the straw appears to bend, but once you remove the straw you see it isn’t really bent at all. This is because the straw is not bending, but the light around the straw is bending due to refraction.

### What causes a straw to appear bent 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.

What do you notice on the part of the straw that is dipped in the water?

Light bends when it passes from one medium (air) into another medium of a different density (water). This bending of light, called refraction, causes the straw to look broken​1​. The portion of the straw that is submerged in water also appears to be wider than the portion of the straw above the water.

Where does refraction occur if you are looking at a straw in a glass of water?

At the surface of the water, the straw appears to be misaligned or broken; the portion of the straw above the water is shifted relative to the image viewed under the water. The bending of the path of light as it passes from the water to air causes the observed distortion of the image of the straw.

## What happens when you bent the straw?

Light refracts (or bends) when it passes from water to air. The straw looks bent because you are seeing the bottom part through the water and air but the top part through the air only. Air has a refractive index of around 1.0003 while water has a refractive index of about 1.33.

### What happened to the straw?

Well, think about what happens when you put a straw into liquid. The liquid rises in the straw, to exactly the same height as the liquid in the glass. That’s because the atmosphere is pushing down on the liquid in the glass. The atmosphere pushes the liquid in the glass up into the straw.

Why does the pencil straw appears to bent What causes this phenomenon?

Because the light can’t travel as quickly in the water as it does in the air, the light bends around the pencil, causing it to look bent in the water. Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.

What do you think the straw was bent?

Explanation: Light bends when it passes from one medium (air) into another medium of a different density (water). This bending of light, called refraction, causes the straw to look broken.

## How do you transfer water using a straw?

1. Cut one of the straws at an angle just below the bendy part. Discard the bendy piece.
2. Pinch the angled end and slide it into the short end of the other straw.
3. Tape the straws together.
4. Insert the taped side of your siphon in the bottle.
5. Such water into the straw.
6. Done!

### How does a straw works?

A straw works because when you suck the air out of the straw, it creates a vacuum. This causes a decrease in air pressure on the inside of the straw. Since the atmospheric pressure is greater on the outside of the straw, liquid is forced into and up the straw and into your mouth (Figure 11.1. 1).