9.3.8 - Power of a Lens
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Practice Questions
Test your understanding with targeted questions
What is the formula for calculating the power of a lens?
💡 Hint: Think about what the letter 'f' represents.
Is the power of a concave lens positive or negative?
💡 Hint: Remember how concave lenses behave with light.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the power of a lens with a focal length of 0.5 m?
💡 Hint: Use the formula P = 1 / f.
A concave lens diverges light. Is its power positive or negative?
💡 Hint: Memorize that divergence indicates negative power.
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Challenge Problems
Push your limits with advanced challenges
If a lens has a power of -5 D, what is its focal length? How does this affect light rays?
💡 Hint: Recall the relationship between power and focal length.
An optician prescribes a lens with a power of +3 D. If a patient has a vision complaint requiring a 0.33 m focal length, will this lens be strong enough?
💡 Hint: Consider comparing focal lengths with the power measurement.
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