Different view with coin in water in Refraction of Light At Plane Surfaces – Class 10 Science Experiment

Chapter Name: Refraction of Light At Plane Surfaces

Activity Name: Different view with coin in water in Refraction of Light At Plane Surfaces

Activity Description:

Different view with coin in water in Refraction of Light At Plane Surfaces - Class 10 Science Experiment

Investigate the formation of an image of a coin at the bottom of a cylindrical transparent vessel when viewed from the water’s surface. Understand the principles of refraction and total internal reflection.

Required Items:

  1. Cylindrical transparent vessel (1 L beaker can be used)
  2. Coin
  3. Water

Step by Step Procedure:

  1. Take the cylindrical transparent vessel or a 1 L beaker.
  2. Place a coin at the bottom of the vessel.
  3. Carefully pour water into the vessel until the coin is no longer visible from the side but forms an image on the water’s surface.
  4. Observe the formed image of the coin on the water surface.

Experiment Observations:

  • The coin becomes invisible when viewed from the side of the vessel due to refraction.
  • An image of the coin is formed on the water’s surface due to the bending of light rays as they pass from water to air.


  1. Handle the vessel and water carefully to avoid spills and accidents.
  2. Make sure the coin is clean and free from any substances that may affect the experiment.
  3. Perform the experiment in a well-lit area to clearly observe the image formation.

Lesson Learnt from Experiment:

The experiment demonstrates the phenomenon of refraction of light at a plane surface, which causes the image of the coin to form on the water’s surface. It also provides a practical example of total internal reflection, which plays a role in various natural occurrences, such as mirages observed during hot summer days.

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