Refraction of Light in Water Experiment (Video)

Have you noticed that things look a little funny when you see them through a glass of water? 

Some of the aberrations are caused by the imperfection in the glass production. But there is more to it.

Refraction is the bending of light as it passes from one transparent medium into another​1​

This bending by refraction allows us to make use of lenses, magnifying glasses, prisms, etc.

It also makes it possible for us to see because our eyes use lenses to focus images onto our retina.

Here are two simple and fun water refraction experiments.

Water Refraction - Light Science Experiment

Refraction of Light in Water

Prep Time: 30 minutes
Active Time: 10 minutes
Total Time: 40 minutes

Here is an easy science experiment you can do to "wow" your kids or friends. It's super simple and you can set it up within minutes.

Materials

  • water
  • graphics you want to see the changes

Tools

  • a clear glass or jar
  • adult supervision

Instructions

  1. Place the glass in front of the graphics.
  2. Adjust the distance between the glass and the graphics until the image can be seen clearly through the empty glass.
  3. Slowly pour the water in and see what happens.
    smiling face behind glass, water poured into the glass, reversed smiling face behind glass full of water
    arrow points right behind glass, arrow points left when the glass is full of water

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Notes

  • Do the experiment again using different distances between the glass and the graphics.
  • Try glasses and jars of different shapes.
  • Try using different liquids such as oil, juice, etc.

Why

Have you noticed that things look a little funny when you see them through a glass of water? 

Some of the aberrations are caused by the imperfection in the glass production. But there is more to it.

Refraction is the bending of light as it passes from one transparent medium into another​1​

This bending by refraction allows us to make use of lenses, magnifying glasses, prisms, etc.

It also makes it possible for us to see because our eyes use lenses to focus images onto our retina.

Refraction Experiment - bending of light from air to water

When light travels through a cylindrical glass, it bends when entering the glass and water, and then it bends again when leaving the water and glass.

As a result, the light paths cross and the image appears to be flipped horizontally (left/right).

Illustration of refraction of light after passing through a glass of water

Science Kits And Books On Light


References

  1. 1.
    Jiang W, Chen RT, Lu X. Theory of light refraction at the surface of a photonic crystal. Phys Rev B. June 2005. doi:10.1103/physrevb.71.245115

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