Measurement of the focal length of a concave mirror (approximate method)

Apparatus

For a concave mirror $\frac{1}{f} = \frac{1}{u} + \frac{1}{v}$

If u is very much greater than the focal length, then $\frac{1}{u} ≈ 0 ⇒ \frac{1}{f} = \frac{1}{v} ⇒ f = v$

Experimental setup diagram

Procedure

Using the concave mirror, focus a distant object, e.g. a tree, on a sheet of paper. The distance from the mirror to the paper is approximately equal to the focal length of the mirror.
This method is useful as it gives the student some idea of the answer to expect when the experiment is done using a more accurate method.

500K+ Students Use These Powerful Tools to Master Reflection & Mirrors For their Leaving Cert Exams.

Enhance your understanding with flashcards, quizzes, and exams—designed to help you grasp key concepts, reinforce learning, and master any topic with confidence!

21 revision notes

Revision Notes on Reflection & Mirrors

Revision notes with simplified explanations for multiple topics.

Try Physics Revision Notes

40 flashcards

Flashcards on Reflection & Mirrors

Revise key concepts with interactive flashcards.

Try Physics Flashcards

4 quizzes

Quizzes on Reflection & Mirrors

Test your knowledge with fun and engaging quizzes.

Try Physics Quizzes

9 questions

Exam questions on Reflection & Mirrors

Boost your confidence with real exam questions.

Try Physics Questions

11 exams created

Exam Builder on Reflection & Mirrors

Create custom exams across topics for better practice!

Try Physics exam builder

117 papers

Past Papers on Reflection & Mirrors

Practice past papers to reinforce exam experience.

Try Physics Past Papers

Other Sample Answers related to Reflection & Mirrors you should explore

Expand your writing skills with more engaging sample answers, covering vivid experiences, places, and unforgettable moments.

96%

114 rated

Reflection & Mirrors

393+ studying

197KViews

View Sample Answer

Load more sample answers

Upload Your Sample Answers for Grading

Get expert feedback, detailed critiques, and tips to improve your writing. Enhance clarity, structure, and exam readiness with personalized insights!

See Sample Answers from other students

See sample answers from other students, showcasing different writing styles and approaches to help you refine your own essays with clarity and creativity.

96%

114 rated

Reflection & Mirrors

Understanding Concave and Convex Mirrors