Physics 8B
14 – Optical Instruments
rev 4.0
1
14 – Optical Instruments
1.
A 12 cm tall candle is at x = 0 cm. There is a lens, f
1
= +10 cm, at x = 30 cm. There
is another lens, f
2
= +6 cm located at x = 60 cm.
For the first lens
a)
What is the object distance?
b)
What are the image distance and xlocation of the image #1?
c)
What is the magnification of image #1 (relative to object #1)?
d)
Draw a qualitatively accurate ray tracing diagram for lens #1.
e)
Why can you use image #1 as the object #2 for the second lens? (Hint : Does the
light stop when it reaches the location of the first image?)
For the second lens
f)
What is the object distance?
g)
What are the image distance and xlocation of the image #2?
h)
What is the magnification of image #2 (relative to object #2)?
i)
(on the same figure) Draw a qualitatively accurate ray tracing diagram for lens #2.
j)
What is the xlocation of the final image for the twolens system? What is the
overall magnification of the twolens system? What is the height and orientation
of the final image relative to the original object? Is the final image real or virtual?
k)
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 Fall '07
 SHAPIRO
 Physics

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