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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 Study Material: Chapter 09 Ray Optics and Optical Instruments
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Access comprehensive study material for Chapter 09 Ray Optics and Optical Instruments, including revision notes, concept maps, and high-probability questions. These resources are designed in alignment with the latest 2026 CBSE syllabus for Class 12 Physics to support effective exam preparation.
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Our advanced study package for Chapter 09 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.
The Mind Maps provided for Chapter 09 Ray Optics and Optical Instruments act as visual anchors which will help faster recall during high-pressure exams.
Yes, teachers use our Class 12 Physics resources for lesson planning as they are in simple language and have lot of solved examples.
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Yes, our subject matter experts have updated the Chapter 09 Ray Optics and Optical Instruments material to align with the rationalized NCERT textbooks and have removed deleted topics and added new competency-based questions.