3B Scientific Advanced Optics Kit (115 V, 50__60 Hz) - Manual (Page 2)

SEK Optics/Optical lenses
Work sheet
1
O401 Path of light through a converging lens (convex lens)
Exercise
x
Investigate the passage of light through a converging lens.
Equipment
From SEK Optics (U8503000)
1 Optical lamp
1 Converging lens
1 Inclined bench and screen
Overlays O401/1, O401/2 and O401/3
Additionally required
1 Ruler
1 Pencil
Set-up and procedure
Fig. 1 Set-up for O401/1
Fig. 2 Set-up for O401/2
Fig. 3 Set-up for O401/3
1) Place overlay O401/1 on the inclined bench.
2) Connect the optical lamp to its power supply.
3) Place the converging lens over the appropriate
marks on the overlay (see Fig. 1).
4) Align the optical lamp and the inclined bench
in such a way that the beam of light hits the
lens as indicated on the overlay.
5) Observe the path of the beams before and after
passing through the lens and trace them onto
the overlay.
6) Repeat the experiment using overlays O401/2
and O401/3 (see Figs. 2 and 3).
Evaluation
Complete the following statements:
1) When light encounters a converging lens, paral-
lel beams are focused towards a
focal point in
a converging beam. After the focal point the
beam then diverges .
2) A converging lens can be identified in that it is
thicker in the middle.
Answer the following question:
Which of the lenses in Fig. 4 are converging lenses?
A B C D
Fig. 4
Correct: A and D