1. T/F: A converging lens has a negative focal length.
Answer:
False. A converging lens has positive focal length. A diverging lens
produces a virtual image (usually upright); converging lens usually
produces inverted, real image.
2. Suppose a positive lens has a focal length f = 20cm
and an object is placed at a distance of d_{o} = 50cm
from this lens. Please calculate the image distance
d_{i} for this situation.
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Answer:
33.33 cm
3. For the above scenario, is the image virtual or
real? Suppose the height of the object is
h_{o} = 10cm and the height of the image is
h_{i} = -16.7cm. Is the image inverted or
upright?
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Answer:
Converging lens so real; negative mag. so inverted
4. Draw a diagram of the eye. Please be sure to include at least the
retina, iris, cornea, and lens.