Ray Optics and Optical Instruments — Syllabus
Telangana Open School (TOSS) · Class 12 · Physics
What Ray Optics and Optical Instruments covers in Telangana Open School (TOSS) Class 12 Physics: 3 topics, for the 2026-27 session.
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Topics in Ray Optics and Optical Instruments
Simple and Compound Microscopes
- A simple microscope uses a single convex lens to produce a virtual, erect, and magnified image.
- The object is placed between the optical center and the focus of the lens.
- Magnifying power depends on the focal length of the lens and the least distance of distinct vision.
Telescopes: Refracting and Reflecting
- Telescopes are used to view distant objects by increasing the visual angle.
- Refracting telescopes use lenses; reflecting telescopes use mirrors.
- An astronomical telescope produces an inverted image, which is acceptable for celestial objects.
Resolving Power and Rayleigh's Criterion
- Due to diffraction, point objects produce finite-sized images surrounded by rings.
- Two close objects cannot be distinguished if their diffraction patterns overlap too much.
- Rayleigh's criterion states that two images are just resolved when the first minimum of one coincides with the central maximum of the other.
Key Concepts
Central concept: Optical Instruments
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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