Power of Lens
Physics ⇒ Light and Optics
Power of Lens starts at 10 and continues till grade 12.
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See sample questions for grade 12
Define the power of a lens and state its SI unit.
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.
Explain why the power of a lens changes when it is immersed in a medium other than air.
The power of a lens is positive if the lens is: (1) Convex (2) Concave (3) Plano-concave (4) None of these
Which of the following combinations will result in a net diverging lens? (1) +2 D and -3 D (2) +4 D and +2 D (3) -1 D and -2 D (4) +3 D and +3 D
Which of the following is the correct unit for the power of a lens? (1) Meter (2) Dioptre (3) Hertz (4) Watt
Which of the following statements is correct? (1) Power of a lens increases as focal length increases (2) Power of a lens decreases as focal length increases (3) Power of a lens is independent of focal length (4) None of these
Fill in the blank: A lens with a focal length of -0.25 m has a power of ______ D.
Fill in the blank: A lens with a focal length of 100 cm has a power of ______ D.
Fill in the blank: The reciprocal of the focal length (in meters) of a lens gives its ______.
True or False: The power of a lens can be zero.
True or False: The power of a lens depends on the medium in which it is placed.
True or False: The power of a lens is the sum of the powers of individual lenses when placed in contact.
True or False: The SI unit of power of a lens is dioptre.
