3B Scientific Laser Optics Supplemental Set - Manual (Page 12)

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E18b Light beam passing through glass concave
lens – the rays are non-parallel to the optical
axis
(U17300/U17301)
The plane
ϕ
' which is perpendicular to the optical axis,
combined with the figure focus F' is called a figure focus
plane. If a beam of perpendicular rays impinges the
concave glass lens, the elongated lines of the rays cross
the plane
ϕ
' at one point.
E19a Light beam passing through air convex lens –
the rays are parallel to the optical axis
(U17301)
The rays are divergent after passing a convex air lens,
they do not create a real figure. By elongating the rays
one can see the lines has a common intersection –
figure focus F'.
E19b Light beam passing through air convex lens –
the rays are non-parallel to the optical axis
(U17301)
The plane
ϕ
' which is perpendicular to the optical axis,
combined with the figure focus F' is called a figure focus
plane. If a beam of perpendicular rays impinges the
convex air lens, the elongated lines of the rays cross
the plane
ϕ
' at one point.
E20a Light beam passing through air concave lens
– the rays are parallel to the optical axis
(U17301)
A concave air lens behaves as a convergent optical sys-
tem and the rays meet at figure focus F' after passing
through the lens.
Air
Air
Air
Air
Air
Acrylic
Acrylic
Acrylic
Acrylic