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FIET Bareilly Photos 2025 - Videos, Images Gallery, Campus, Hostel

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Updated on - Oct 31, 2023 07:51 PM IST

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Related Questions

J

Jayita Ekka, Content Team

-Answered on Feb-11-2025

Dear student,

You are asking if the focal length of a lens is 20 cm, what is its power in diopters?

Calculating Lens Power:

  • Power of a lens is defined as the reciprocal of its focal length when expressed in meters
  • The unit of power of a lens is diopter (D)

Formula:

  • Power (P) = 1 / focal length (in meters)

Given:

  • Focal length (f) = 20 cm = 0.2 meters

Calculation:

  • Power (P) = 1 / 0.2 = 5 diopters

Therefore, the power of the lens is +5 diopters

Why is it positive?

  • A positive power indicates a convex lens (converging lens)
  • Convex lenses are thicker at the center and thinner at the edges
  • They converge light rays to a point called the focus

convex lens

Additional Notes:

  • Concave Lens: If the lens were concave (diverging lens), the power would be negative
  • Units: Always ensure that the focal length is converted to meters before calculating the power in diopters

Therefore, if a lens has a focal length of 20 cm, its power is +5 diopters. This means it is a convex lens capable of converging light rays.

H

Heemaal Aer, Student / Alumni

-Answered on July-18-2023
LPU offers B.Tech. (Mechanical Engineering) [Lateral Entry] and Duration is of 3 yrs. (6 Semesters). This Engineering Programme seamlessly articulates the concepts from basic science to technology with relevant practice through lab and projects for building the problem solving skills, keeping industry requirements in place for Design, Manufacturing, Thermal etc specialization. Eligibility Criteria is: Pass with 60% aggregate marks in Diploma (Engg.) (any stream) 3 years after 10th Or 2 years after 10+2 (Non-Medical) Or B.Sc. (Non-Medical) Or B.Sc. (Computer Science) or equivalent, subject to qualifying LPUNEST*.

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