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 11
A combination of two lenses has a net power of 0 D. If one lens has a power of +3 D, what is the power of the other lens?
A lens has a focal length of +0.5 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 100 cm. What is its power in dioptres?
A lens has a focal length of 200 cm. What is its power?
A lens has a focal length of -25 cm. What is its power?
A lens has a power of +0.25 D. What is its focal length in meters?
A lens has a power of +5 D. What type of lens is it?
A lens has a power of -10 D. What is its focal length in centimeters?
A person uses spectacles of power +2.5 D. What is the focal length of the lens used?
A student combines a +4 D lens and a -6 D lens. What is the resulting power?
Define the power of a lens and state its SI unit.
Describe how the power of a lens changes if its focal length is doubled.
Explain the significance of the sign of the power of a lens.
Explain why the power of a concave lens is negative.
If a lens has a focal length of 40 cm, what is its power?
If a lens has a power of 0.5 D, what is its focal length in centimeters?
If the power of a lens is +1.5 D, what is its focal length in meters?
If the power of a lens is zero, what is its focal length?
If two lenses of powers +2 D and +3 D are placed in contact, what is the total power?
