Practice Sign Convention For Spherical Lenses (9.3.6) - Light

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9 questions

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6 sample questions

Question 1.
What is the sign of the focal length for a convex lens?
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Remember the behavior of light with convex lenses.
Question 2.
What does it mean if an object is located at -15 cm from the optical center?
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Think about the direction of measurements.
3Question 3.
What is the focal length of a convex lens?
- Positive
- Negative
- Zero
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Think about how the lens focuses light.
4Question 4.
A concave lens has a focal length of -15 cm. Is this lens diverging or converging?
- Diverging
- Converging
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Recall the characteristics of concave lenses.
Question 5.
A concave lens produces a virtual image at 4 cm from the lens when the object is placed at 6 cm. Calculate the focal length.
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Don’t forget the signs when substituting values!
Question 6.
Given a convex lens with a focal length of +20 cm, determine the image distance for an object placed at +30 cm.
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Pay attention to where each measurement is taken from.

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