O-Level Physics Optics Practical Handbook (Paper 3)

Study guide30 Nov 2025, 00:00 ZUpdated 17 Jul 2026

Reviewed by

Chee Wei Jie·Academic Advisor (Physics)

TL;DR
SEAB’s 2026 O-Level Physics syllabus (6091) lists optics and wave investigations-lenses, mirrors, refraction, wave speed-as staple Paper 3 tasks.
Earn MMO marks by rehearsing precise alignment, consistent ray tracing, and clean oscilloscope or timer readings within the shared apparatus slot.
ACE marks hinge on linking experimental gradients to lens/mirror equations, propagating measurement uncertainty, and proposing refinements grounded in the syllabus skill strands.

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Keep Your Physics Practical Stack On Track

Use our O-Level Physics Experiments hub to find companion drills for every Paper 3 skill before you attempt these walkthroughs.

1 | What the syllabus expects for optics and waves

The 2026 O-Level Physics syllabus highlights ray diagrams, refraction (Snell’s law), lens formulae, and wave measurements as core practical experiences. Section 4 (Practical Assessment) explicitly states that Paper 3 tasks sample the four skill strands-Planning (15 %), MMO, PDO, ACE-across these experiments.
Candidates may be asked to determine focal length, verify

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Investigation	MMO checkpoints
Focal length of convex lens	Level the bench, set lens at the optical axis, adjust screen until the image is sharp, measure $u$ and $v$ using a metre rule with mm marks.
Mirror formula verification	Use a plane mirror to align object and image heights, read distances at eye level to reduce parallax, repeat while averaging forward/back setups.
Refraction through glass block	Mark normal lines accurately, use pins at least 5 cm apart, measure angles with a protractor only once the refracted ray is extended clearly.
Ripple tank wave speed	Stabilise frequency with a signal generator, use a stroboscope or video frame count, measure 10+ wavelengths for averaging.

O-Level Physics Optics Practical Handbook (Paper 3)

Keep Your Physics Practical Stack On Track

1 | What the syllabus expects for optics and waves

Want supervised lab practice?

2 | Planning framework before you touch the kit

3 | MMO drill table for common optics setups

4 | PDO: presenting your optics data cleanly

5 | ACE commentary templates

6 | Quick practice prompts

Sources

Keep Your Physics Practical Stack On Track

1 | What the syllabus expects for optics and waves

Want supervised lab practice?

2 | Planning framework before you touch the kit

3 | MMO drill table for common optics setups

4 | PDO: presenting your optics data cleanly

5 | ACE commentary templates

6 | Quick practice prompts

Sources

1 | What the syllabus expects for optics and waves

2 | Planning framework before you touch the kit

3 | MMO drill table for common optics setups

4 | PDO: presenting your optics data cleanly

5 | ACE commentary templates

6 | Quick practice prompts