Exercises

Two spotlights illuminate a screen where 5 points are located but an opaque AB object is placed between them. According to the chart determine:

A.- which points on the screens light up from the focus 1→,2,4,5

B.- Which points of the screen are illuminated only by the focus 2→4

C.- Which points of the screen are illuminated at the same time by the two spotlights →,2,4,5


D.- At which point shadows are generated →3

3 spotlights illuminate a screen where 7 points are located and an opaque object is placed in this light projector as shown in the graphic. according to this illustration determine: 

A) which points are illuminated by F1: P1 P2 P2 P3 P7

B) which points are illuminated only by F3: P5

C) which points are illuminated at the same time by the 3 spotlights: P1 P7

D) at which points darkness is formed and in which shade: P2 P3 P3 P5 P6

E) if the spotlights are on only F1 and F2, at which points only F2 illuminates: F6