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Formula Sheet

Optical Instruments — Formula Sheet

ICSE · Class 12 · Physics

13 formulas from Optical Instruments (ICSE Class 12 Physics) on one page, grouped by topic. Part of the ICSE Class 12 Physics syllabus.

42 questions34 flashcards13 formulas & key relations5 concepts

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13 Entries · 5 Sections

Formulas and Key Relations

1. Eye, Visual Angle, and Accommodation

Power of accommodation = change in focal length of the eye lens

Least distance of distinct vision, D = 25 cm

Visual angle = angle subtended by an object at the eye

2. Simple Microscope

M = D/u

M = 1 + D/f

M = D/f

3. Compound Microscope

M = m_e × m_o

m_o = f_o/(u_o - f_o)

M = -(v_o/u_o)(1 + D/f_e)

M = -(v_o/u_o)(D/f_e)

4. Astronomical Refracting Telescope

M = -f_o/f_e

M = -(f_o/f_e)(1 + f_e/D)

Key relations

For a relaxed eye, M = D/f.

Full sheet with units and worked examples

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Frequently Asked Questions

What are the important topics in Optical Instruments for ICSE Class 12 Physics?
Key topics in Optical Instruments include Power of Accommodation and Visual Angle, Simple Microscope, Compound Microscope, Astronomical Refracting Telescope. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many formulas are in Optical Instruments?
This sheet lists 13 formulas from Optical Instruments, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Optical Instruments for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 42 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.

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All ICSE Class 12 Physics Formula Sheet

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