Practice Mirrors And Lenses (3) - Propagation of Light and Geometric Optics

Practice: Mirrors and Lenses

Lesson 3Propagation of Light and Geometric Optics

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9 questions

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Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the mirror equation?
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Think about the relationship between focal length, image distance, and object distance.
Question 2.
What does positive magnification indicate?
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Remember how images are formed in mirrors versus lenses.
3Question 3.
What is the formula for the lens equation?
- \\( \\frac{1}{f} = \\frac{1}{v} + \\frac{1}{u} \\)
- \\( \\frac{1}{f} = \\frac{1}{v} - \\frac{1}{u} \\)
- \\( \\frac{1}{f} = \\frac{1}{v} \\times \\frac{1}{u} \\)
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Look for the formula that is specifically for lenses.
4Question 4.
True or False: The magnification is always positive for images formed by concave mirrors.
- True
- False
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Consider how images can be formed in mirrors.
Question 5.
You have a concave mirror with a focal length of 20 cm. An object is placed 15 cm in front of it. Where is the image located?
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Make sure to invert the distances appropriately.
Question 6.
A double convex lens has a focal length of 15 cm. If an object is 30 cm from the lens, compute the image distance and magnification.
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Start by using the lens formula clearly and pay attention to which side the image forms.

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