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With the help of diagrams, explain the difference between the regular and irregular reflection.
In the figure is shown a concave mirror. A is a point on the principal axis. If an object O is kept at A, image is formed on A itself. Copy the diagram. Draw the image in the diagram. Is the image real or virtual?
Measure the distance PA and write it in the diagram. What is the distance PA called?
Mark a point B on the principal axis, at which, if a point source of light is kept, the rays travel parallel to principal axis after reflection from M. What is point B called?
Locate the image termed when the object is placed between two planes as shown in the following figure.
A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light ______.
______ through which light cannot pass.
Materials which reflect the light well are called ______.
Which of the following can make a parallel beam of light when light from a point source is incident on it?
Total internal reflection will occur if the angle of reflection is ______.
A burning candle in water
Take a shoe box, open on one side. Place a small lighted candle in it. Place a clear glass sheet (roughly 25 cm × 25 cm) in front of this candle figure. Try to locate the image of the candle behind the glass sheet. Place a glass of water at its position. Ask your friends to look at the image of the candle through the sheet of glass. Ensure that candle is not visible to your friends. Your friends will be surprised to see the candle burning in water. Try to explain the reason.
