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2 cards from this section. Quick, good the night before a test.
What is the power of a lens with a focal length of 0.5 meters?
Use the formula P = 1/f.
A concave lens has a focal length of -0.5 m. What is its power?
Similar formula applies for negative focal lengths.
What is the unit of power for a lens?
Think of the formula involving focal length.
True or False: A concave lens has positive power.
Remember the relationships between lens types and their power.
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?
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?
Addition of powers: Practicing it makes perfect!
4 more questions in this section. Enroll free to practise them all.
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