REFLECTION 97 



References : 



1. 1103 : 168-169. Reflection of Light. 



2. 1304 : 235-236. Reflection and Absorption. 



3. 1803:395-396. Reflection, 

 a. 1305 : 102-103. The Mirage. 

 6. 1801 : 196-197. Reflection. 



c. 1802 : 212-217. Reflection of Light. 



d. 1804 : 331. Reflection of Light. 



e. 1805:225-227. Reflection. 

 /. 1806 : 150-151. Reflection. 



g. 1807 : 268-269. Reflection of Light. 



h. 1808:382-383. Reflection. 



i. 1809 : 283-288. Reflection at Plane Surfaces. 



Experiment 34. Reflection. 



Apparatus : Piece of mirror glass 5" X 2" with a transverse 

 scratch at its middle point, block of wood 5" X 2", two elas- 

 tic bands, pins, protractor. 



Materials : Sheet of note paper. 



a. Draw a straight line across the paper and place the mir- 

 ror, attached to the block of wood by means of the elastic 

 bands, so that the silvered surface lies along the line. Slip the 

 protractor under the edge of the mirror so that its diameter is 

 also on the line, with its middle point under the scratch. 

 Mark every 5 on the paper, at the edge of the protractor, 

 numbering from zero, at the middle mark, to ninety at each 

 end of the diameter. 



6. Stick a pin at the 5 mark and look for its reflection in the 

 mirror. Stick another pin, near the protractor, in line with 

 the reflection and the center mark. Where is the last pin ? 



c. Make several trials, sticking the first pin in different 

 places. Are you satisfied with your results? Tabulate 

 them. 



