Physics · Total internal reflection and its applications, magnification, power of a lens, combination of thin lenses in contact
A focal length of a lens is What is power of a lens in dioptre?
A focal length of a lens is \( 10 \mathrm{cm} . \) What is power of a lens in dioptre?
- A. 0.10
- B. 10 D
- C. 15 \( D \)
- D. 20 D
Step-by-step solution
Power of a lens (in dioptres) is the reciprocal of the focal length in meters. Given focal length = 10 cm = 0.1 m, so power P = 1/0.1 = 10 D.
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