Power of Lens
Physics ⇒ Light and Optics
Power of Lens starts at 10 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Power of Lens.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 10
A concave lens has a focal length of -25 cm. What is its power?
A lens has a focal length of -0.1 m. What is its power?
A lens has a focal length of -0.2 m. What is its power?
A lens has a focal length of 0.25 m. What is its power?
A lens has a focal length of 10 cm. What is its power in dioptres?
A lens has a focal length of 100 cm. What is its power in dioptres?
A lens has a focal length of 25 cm. What is its power?
A lens has a power of +10 D. What is its focal length in millimetres?
A lens has a power of +3 D. Is it a converging or diverging lens?
A lens has a power of +4 D. What is its focal length in centimetres?
A lens has a power of -10 D. Is it a converging or diverging lens?
A person uses spectacles of power -3 D. What is the focal length of the lens used?
Describe how the power of a lens is related to its ability to converge or diverge light.
Explain the significance of the sign of the power of a lens.
Explain why the power of a concave lens is always negative.
If a lens has a focal length of 0.5 m, what is its power?
If a lens has a power of +0.25 D, what is its focal length in metres?
If a lens has a power of +8 D, what is its focal length in metres?
If a lens has a power of -0.5 D, what is its focal length in metres?
If the focal length of a lens is 2 m, what is its power in dioptres?
