Page:Optics.djvu/222

PLATE III.

36

[return]

37

[return]

38

[return]

39

[return]

40

[return]

41

[return]

42

[return]

43

[return]

44

[return]

45

[return]

46

[return]

47

[return]

48

[return]

49

[return]

50

[return]

51

[return]

52

[return]

53

[return]

54

[return]