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The figure is the top view of a room. Red and green light bulbs separated by 0.25 m shine through the door and illuminate the back wall.
Over what range of
is the back wall illuminated by the red light?
Over what range of
is the back wall illuminated by the green light?

http://img239.imageshack.us/my.php?image=204br3.jpg%5D%5Bimg=http://img239.imageshack.us/img239/9123/204br3.th.jpg
Over what range of
Over what range of

http://img239.imageshack.us/my.php?image=204br3.jpg%5D%5Bimg=http://img239.imageshack.us/img239/9123/204br3.th.jpg