Read and download the CBSE Class 12 Physics Optical Instrument Solved Examples. Designed for 2025-26, this advanced study material provides Class 12 Physics students with detailed revision notes, sure-shot questions, and detailed answers. Prepared by expert teachers and they follow the latest CBSE, NCERT, and KVS guidelines to ensure you get best scores.
Advanced Study Material for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments
To achieve a high score in Physics, students must go beyond standard textbooks. This Class 12 Chapter 9 Ray Optics and Optical Instruments study material includes conceptual summaries and solved practice questions to improve you understanding.
Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Notes and Questions
CBSE Class 12 Physics Optical Instrument Solved Examples. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.
Ex.1 A 35 mm film is to be projected on a 20 m bwide screen situated at a distance of 40 m from the film- projector. Calculate the distance of the film from the projection lens and focal length of projection lens.
Sol. As in case of projector,
Ex.2 A compound microscope has an objective of focal length 2 cm and an eye- piece of focal length 5 cm. If an object is placed at a distance of 2.4 cm in front of the field lens, find the magnifying power of the instrument and length of the tube if (a) final image is at infinity (b) final image is at least distance of distinct vision ( = 25 cm).
Sol. As object is at a distance of 2.4 cm. in front of field lens of focal length 2 cm. field lens will form its image at distance v such that and .
L = v + ue = 12 + 5 = 17 cm. In this situation eye is said to be relaxed and for a given microscope MP is minimum while length of tube maximum
Ex.3 In a compound microscope the objective and the eye- piece have focal lengths of 0.95 cm and 5 cm respectively, and are kept at a distance of 20 cm. The last image is formed at a distance of 25 cm from the eye- piece. Calculate the position of object and the total magnification.
Sol. As final image is at 25 cm in front of eye piece
Ex.4 A Galilean telescope consists of an objective of focal length 12 cm and eye- piece of focal length 4 cm. What should be the separation of the two lenses when the virtual image of a distant object is formed at a distance of 24 cm from the eye- piece? What is themagnifying power of telescope under this condition?
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CBSE Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Study Material
Students can find all the important study material for Chapter 9 Ray Optics and Optical Instruments on this page. This collection includes detailed notes, Mind Maps for quick revision, and Sure Shot Questions that will come in your CBSE exams. This material has been strictly prepared on the latest 2026 syllabus for Class 12 Physics. Our expert teachers always suggest you to use these tools daily to make your learning easier and faster.
Chapter 9 Ray Optics and Optical Instruments Expert Notes & Solved Exam Questions
Our teachers have used the latest official NCERT book for Class 12 Physics to prepare these study material. We have included previous year examination questions and also step-by-step solutions to help you understand the marking scheme too. After reading the above chapter notes and solved questions also solve the practice problems and then compare your work with our NCERT solutions for Class 12 Physics.
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Our advanced study package for Chapter Chapter 9 Ray Optics and Optical Instruments includes detailed concepts, diagrams, Mind Maps, and explanation of complex topics to ensure Class 12 students learn as per syllabus for 2026 exams.
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