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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the formula for calculating the power of a lens?
💡 Hint: Think about what the letter 'f' represents.
Question 2
Easy
Is the power of a concave lens positive or negative?
💡 Hint: Remember how concave lenses behave with light.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the power of a lens with a focal length of 0.5 m?
- +2 D
- -2 D
- +0.5 D
- -0.5 D
💡 Hint: Use the formula P = 1 / f.
Question 2
A concave lens diverges light. Is its power positive or negative?
- True
- False
💡 Hint: Memorize that divergence indicates negative power.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
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.
Question 2
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.
Challenge and get performance evaluation