Practice - Power of a lens
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions
What is the power of a lens with a focal length of 0.5 meters?
💡 Hint: Use the formula P = 1/f.
A concave lens has a focal length of -0.5 m. What is its power?
💡 Hint: Similar formula applies for negative focal lengths.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What is the unit of power for a lens?
💡 Hint: Think of the formula involving focal length.
True or False: A concave lens has positive power.
💡 Hint: Remember the relationships between lens types and their power.
Get performance evaluation
Challenge Problems
Push your limits with advanced challenges
Calculate the power of a lens with a focal length of 15 cm. What if the same lens is now submerged in water with a refractive index of 1.33?
💡 Hint: Don't forget to apply the refractive index when submerged!
An optician has both a -4D and a +5D lens. What type of lens system can she create, and what will be the resulting power?
💡 Hint: Addition of powers: Practicing it makes perfect!
Get performance evaluation
Reference links
Supplementary resources to enhance your learning experience.