To investigate how the angle of deviation in a glass block depend on the angle of incidence.

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Planning:

Simple procedure:

Make the light ray from the ray box pass through the glass block by changing the angle of incidence several times and measure the angle of deviation for each angle of incidence.

Apparatus:

Reading ranges: The range of angle of incidence will from 0° to 89°and  10°difference between them.

Safety: Wood board will be needed to prevent any fires by placing the bulb in the ray box too long on the table and heat the table up. Avoid our hands with touching the bulb directly and scald the skins.

Method: Use the above apparatus to see what the angle of deviation is when we have a particular angle of incidence. Repeat this by using different value of angles i.

Steps:

  • Place a board on the table and put a piece of A3 paper on it.
  • Place a glass block on the paper and draw its shape along its edges.
  • Draw a normal line on the block frame on the paper.
  • Draw the angle of incidence with a particular value.
  • Switch on the ray box and make the light ray overlap the incidence ray.
  • Draw the refracted ray that overlaps the light ray which is bent away the normal.
  • Connect the incidence ray and refracted ray.
  • Measure each angle of deviation which is relative each angle of incidence.
  • Repeat the experiment and record different results.

(Measure all the angles by using a protractor.)

Valid Evidence:

  • Vary angle of incidence (independent variable) by moving the ray box further away form the normal. After that I need to measure the angle of deviation by using a protractor.
  • Control variables for  a fair test, I will have to keep the following factors the same:
  1. Same glass block          
  2. Ray box distance from block (This can affects the width of light ray and the brightness as well)
  3.  Use the same light box (Different light box may have different colors and brightness)
  4. Ensure apparatus not knocked/moved during measurement (This makes our results will not be accurate)  
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  • Simple Result Table & Simple diagram of general theory:                                                                                                              

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