Question
Download Solution PDFThe power of a convex lens of focal length 20 cm is _______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 5.0 D
Key Points
- Power of a convex lens
- The power of a lens is its capacity to alter the light that enters it. Because a lens with a shorter focal length bends lights more, it has more power.
- The light rays converge toward the principal axis in a convex lens, while the light rays diverge away from the principal axis in a concave lens.
- Here, P=1/f
- The inverse of a lens's focal length (f) in meters (m) is its power.
- A lens's power is measured in m-1. Diopter is another name for this.
Additional Information
- Calculations
- Given, Convex lens
Focal Length, f = 20cm= 20/100=0.2m
We know, P=1/f
So putting values in formula
P=1/0.2=10/2
P= 5.0D
- Given, Convex lens
Last updated on Jun 2, 2025
-> The RRB NTPC Admit Card 2025 has been released on 1st June 2025 on the official website.
-> The RRB Group D Exam Date will be soon announce on the official website. Candidates can check it through here about the exam schedule, admit card, shift timings, exam patten and many more.
-> A total of 1,08,22,423 applications have been received for the RRB Group D Exam 2025.
-> The RRB Group D Recruitment 2025 Notification was released for 32438 vacancies of various level 1 posts like Assistant Pointsman, Track Maintainer (Grade-IV), Assistant, S&T, etc.
-> The minimum educational qualification for RRB Group D Recruitment (Level-1 posts) has been updated to have at least a 10th pass, ITI, or an equivalent qualification, or a National Apprenticeship Certificate (NAC) granted by the NCVT.
-> This is an excellent opportunity for 10th-pass candidates with ITI qualifications as they are eligible for these posts.
-> The selection of the candidates is based on the CBT, Physical Test, and Document Verification.
-> Prepare for the exam with RRB Group D Previous Year Papers.