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 10
A lens has a power of +3 D. Is it a converging or diverging lens?
A lens has a power of -10 D. Is it a converging or diverging lens?
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.
The power of a lens is +5 D. Is the lens converging or diverging?
The power of a lens is zero. What can you say about its focal length?
A student claims that a lens with a power of 0 D will not bend light rays passing through it. Is this statement true or false? Justify your answer.
A student combines three thin lenses in contact with powers +3 D, -2 D, and +1 D. What is the total power of the combination, and what is the nature of the resulting lens?
Which lens would be used to correct hypermetropia (farsightedness)?
(1) Lens with positive power
(2) Lens with negative power
Which of the following combinations will result in a lens of zero power?
(1) +2 D and -2 D
(2) +3 D and +3 D
(3) -1 D and -1 D
(4) +1 D and +2 D
Which of the following is the correct unit for the power of a lens?
(1) Metre
(2) Dioptre
(3) Newton
(4) Watt
Which of the following is true about the power of a lens?
(1) It is always positive
(2) It can be positive or negative
(3) It is always negative
(4) It is always zero
Fill in the blank: The formula for the power of a lens is P = ______, where f is the focal length in metres.
The power of a lens is defined as the ______ of its focal length (in metres).
If the power of a lens is -5 D, its focal length is ______ metres.
True or False: A convex lens always has positive power.
True or False: The higher the power of a lens, the shorter its focal length.
True or False: The power of a lens depends on the material of the lens.
True or False: The power of a lens is additive when lenses are placed in contact.
