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Formula Sheet

Optical Instruments

NIOS · Class 12 · Physics

All formulas from Optical Instruments in NIOS Class 12 Physics. Key equations, constants, and identities for board exam preparation.

43 questions40 flashcards5 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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11 Formulas · 3 Sections

Formulas

Simple Microscope (Magnifying Glass)

M = 1 + D/f

M = D/f

Compound Microscope

M = m_o × m_e

m_e = 1 + D/f_e

M = (v_o/u_o) × (1 + D/f_e)

M = (L/f_o) × (1 + D/f_e)

M = (v_o/u_o) × (D/f_e)

Refracting Telescope (Astronomical Telescope)

M = f_o / f_e

M = −(f_o/f_e) × (1 + f_e/D)

Length of telescope (normal adjustment) = f_o + f_e

Brightness ratio B = D² / d²

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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 Correct Formula Selection: Microscopes and Telescopes, Optical Instruments - Complete Chapter Mind Map, Optical Instruments – Complete Chapter Mind Map. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Optical Instruments — NIOS Class 12 Physics?
Understand the core concepts first, then work through the 43 practice questions available for this chapter. Revise formulas and 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.

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