9.2.1 - Sign convention
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Practice Questions
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What does the pole of a spherical mirror represent?
💡 Hint: Think about the reference point in the mirror.
What are the measurements of heights taken regarding the principal axis?
💡 Hint: Remember the direction of measurement!
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Interactive Quizzes
Quick quizzes to reinforce your learning
In the sign convention, distances measured in the direction of incident light are considered:
💡 Hint: Think about the direction of movement.
True or False: The focal length of a convex lens is negative.
💡 Hint: Recall the classification of lenses.
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Challenge Problems
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An object is placed at -15 cm in front of a concave mirror with a radius of curvature of 30 cm. Determine the image distance and state whether the image is real or virtual.
💡 Hint: Remember the signs for concave mirrors!
If a convex lens has a focal length of +20 cm and an object is placed at -40 cm, what would be the image distance?
💡 Hint: Use the signs correctly in your calculations.
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