Unit of power of a lens is________________?
Correct answer: C. diopter
- A. meter
- B. watt
- C. diopter
- D. horsepower
Explanation
The power of a lens is P = 1/f, where f is in metres, so its unit is m^-1, called the dioptre. For example, a lens with f = 0.5 m has P = 1/0.5 m = 2 dioptres. Watt and horsepower are units of power in mechanics, not optical lens power.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
Practise Optics
665 free Optics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 11 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Optics questions
The power of a concave lens is_______________?
If an object is placed away from 2f of a converging lens then the image will be_______________?
Magnifying power of simple microscope______________?
A three-dimensional image is obtained by________________?
In the electron microscope, electric & magnetic fields are used as_______________?
In an electron microscope, we use energetic particles because of______________?