Answer to station eight

Axis of the streak is 1200
Lens used is -1.00DS
Axis of the streak is 300
Lens used is +0.50DS

a. Draw the power cross taking into account the working distance.
     Remember that the power is 90 degrees to the axis and a working distance of 2/3 
     meters is equivalent to -1.50DS. The power cross is as below:

Return to station 8
Return to mock examination 10