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Study Plan

Optical Instruments — Study Plan

NIOS · Class 12 · Physics

A step-by-step study plan for Optical Instruments, NIOS Class 12 Physics: what to learn first, what to practise and when to revise.

43 questions40 flashcards14 formulas & key relations5 concepts

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A ray diagram illustrating the working of a simple microscope (converging lens) to produce a magnified, virtual, and erect image when the object is placed between the optical center and the focal poin
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An illustration from Super Tutor's Optical Instruments chapter — alongside flashcards, concept maps and practice questions.

Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas and key ideas. Focus on: Key Definitions and Basic Concepts, Simple Microscope (Magnifying Glass), Compound Microscope.

2
Day 3

Practise

Solve the textbook exercises and extra practice questions. There are 43 questions available for this chapter.

3
Day 4

Revise & Test

Revise key points without looking at your notes. Take a practice quiz and mark weak areas for another pass.

4
Day 7

Spaced Revision

Come back to Optical Instruments after a week. Use flashcards for quick recall and try past exam questions on this chapter.

What to Focus On

  • Least distance of distinct vision D = 25 cm for a normal human eye
  • Near point varies with age — closer for young people, farther for elderly
  • Angular magnification M = β/α (ratio of angles, not sizes)
  • Simple microscope = single convex lens of short focal length
  • Object must be placed between F and O of the lens
  • Image is virtual, erect, and magnified
  • Compound microscope uses TWO convex lenses — objective (short f, small aperture) and eyepiece (short f, larger aperture)
  • Magnification occurs in TWO stages: first by objective, then by eyepiece
  • Total magnifying power: M = mₒ × mₑ = (vₒ/uₒ) × (1 + D/fₑ)

Common Mistakes to Avoid

Magnifying power and linear magnification (m = v/u) are the same thing.

In a compound microscope, using lenses of LONGER focal length gives higher magnification.

The formula M = 1 + D/f applies to ALL microscopes and ALL situations.

Memory Tips

Least Distance of Distinct Vision (D = 25 cm)

Simple Microscope Formula: M = 1 + D/f

Normal Adjustment — image at infinity, M = D/f for simple microscope

Compound Microscope: Objective has shorter focal length than eyepiece

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Frequently Asked Questions

What are the important topics in Optical Instruments for NIOS Class 12 Physics?
Key topics in Optical Instruments include Key Definitions and Basic Concepts, Simple Microscope (Magnifying Glass), Compound Microscope, Refracting Telescope (Astronomical Telescope). Study these first, then practise questions on each for the NIOS Class 12 board exam.
How should I revise Optical Instruments for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 43 practice questions on Optical Instruments. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Optical Instruments

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