Extra Explaining Question - LIGHT

LIGHT

1. Imagine you are looking your face using a plane mirror, note out five characteristics of your face image.
   [Show answer]

   Characheristics of image formed by a plane mirror
   

   1. Same size as the object
      Your image appears exactly the same size as your actual face.
   2. Virtual
      The image cannot be projected on a screen because it is formed behind the mirror.
   3. Laterally inverted
      The left side of your face appears on the right in the mirror and vice versa.
   4. Erect
      The image is upright, not upside down.
   5. Same distance behind the mirror as the object is in front
      If you stand 50 cm from the mirror, the image appears 50 cm behind it.
   
   


2. Briefly explain three (3) evidences to show that concave mirrors are useful in daily life.


3. Why do different colours of light refract through different angle when light enters a prism?


4. By the aid of diagram, state the procedures to be followed when measuring the refracted index of water by the aid of the apparent – depth method


5. Explain why a red flower looks red when seen in white light?


6. What colour does the red flower appear to be when seen in;
   1. red light
   2. green light


7. Explain with the aid of diagram, why water in a swimming pool appears to be shallower than it really is.


8. Why does the sky appear blue while being observed from the earth and black when you are on the moon?


9. Briefly explain the two (2) ways of combining the colours of the spectrum into white light.


10. Briefly explain two conditions for the occurrence of total internal reflection.


11. Amina has a flag with blue-green (cyan) paints which she wants to make a pure green. As a form four student help Amina which should be added to the paint to make pure green? Hence explain the reasons of your answer.