Physics
Ray optics for JEE Main & Advanced — mirrors, lenses, and optical instruments
Why ray optics is consistently high weight across both papers and how to standardise sign conventions.
On JEE Main
Main tests mirror and lens formula, refraction at spherical surfaces, total internal reflection, and simple optical instruments (microscope, telescope) in single-correct MCQ format. Consistent sign convention (real-is-positive or new Cartesian) applied from the start prevents sign errors.
On JEE Advanced
Advanced uses multi-correct and integer formats with combinations of lenses and mirrors, equivalent lens problems, silvered lens systems, and longitudinal/lateral magnification in compound setups. Paragraph-based questions trace the image through three or more optical elements sequentially.
How to practise
Practise Ray Optics on PracticeJEE after electromagnetic waves for a natural progression into wave optics.
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