Question
Download Solution PDFA concave lens has a focal length of −2 cm. What is its power?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is -50 D.
Key Points
- A concave lens is a lens that diverges light rays that are incident upon it.
- The focal length of a concave lens is always taken as negative because it diverges light rays.
- The formula to calculate the power of a lens is P = 1/f, where P is power in diopters (D) and f is the focal length in meters.
- Given the focal length f = -2 cm, we need to convert it to meters: -2 cm = -0.02 m.
- Using the formula P = 1/f, we get P = 1/(-0.02) = -50 D.
Additional Information
- Concave Lens
- A concave lens is also known as a diverging lens.
- It is thinner at the center and thicker at the edges.
- It is used in devices such as glasses for nearsightedness and some types of cameras.
Last updated on Jun 7, 2025
-> RRB JE CBT 2 answer key 2025 for June 4 exam has been released at the official website.
-> Check Your Marks via RRB JE CBT 2 Rank Calculator 2025
-> RRB JE CBT 2 admit card 2025 has been released.
-> RRB JE CBT 2 city intimation slip 2025 for June 4 exam has been released at the official website.
-> RRB JE CBT 2 Cancelled Shift Exam 2025 will be conducted on June 4, 2025 in offline mode.
-> RRB JE CBT 2 Exam Analysis 2025 is Out, Candidates analysis their exam according to Shift 1 and 2 Questions and Answers.
-> The RRB JE Notification 2024 was released for 7951 vacancies for various posts of Junior Engineer, Depot Material Superintendent, Chemical & Metallurgical Assistant, Chemical Supervisor (Research) and Metallurgical Supervisor (Research).
-> The selection process includes CBT 1, CBT 2, and Document Verification & Medical Test.
-> The candidates who will be selected will get an approximate salary range between Rs. 13,500 to Rs. 38,425.
-> Attempt RRB JE Free Current Affairs Mock Test here
-> Enhance your preparation with the RRB JE Previous Year Papers.