3B Scientific U14600 Optics on magnetic boards - Manual (Page 5)

Exp.15: Reversing prism
In this experimental setup total internal
reflection and refraction cooperate to
reverse the positions of the two parallel
rays.
Exp.16: Angle of minimum deviation
The deviation of a pencil of light through
the prism is most easily observed when
the light passes through the prism just
below one of the 45° angles. The angle of
minimum deviation is quickly found
experimentally.
Exp.17: Focal Length of a plano-
convex lens
The focal length of a plano-convex lens is
determined by two rays parallel to the
optical axis. They intersect in the focal
point F.
Exp.18: Focal Length of a plano-
concave lens
Two rays parallel to the optical axis are
refracted by the plano-concave lens.
Extensions of the refracted rays are
drawn on the board until they intersect in
the focal point F.