Light Energy: JAMB Physics Questions, Answers & Notes

What Light Energy covers in the JAMB Physics syllabus

Light is a form of energy that travels in straight lines (rectilinear propagation) at about 3 × 10⁸ m/s in a vacuum. Luminous objects make their own light (Sun, lamp); non-luminous objects (Moon, a book) are seen by reflected light. Materials are transparent (clear glass), translucent (frosted glass — light scattered) or opaque (blocks light). Because light travels straight, opaque objects cast shadows with a dark umbra and lighter penumbra; a solar eclipse has the Moon between Sun and Earth, a lunar eclipse the Earth between Sun and Moon. A pinhole camera forms a real, inverted image.

For Light Energy, JAMB expects you to be able to:

• Explain rectilinear propagation of light and luminous/non-luminous, transparent/opaque objects
• Explain shadows, umbra/penumbra and eclipses
• Describe the pinhole camera and image formation

Key facts & revision notes: Light Energy

These are the recurring points our Light Energy questions test — revise them until each feels automatic, then practise the questions above to lock them in.

• Light travels in straight lines (rectilinear propagation).
• A luminous object produces its own light (e.g.
• A transparent material (like clear glass) lets light pass through so objects can be seen clearly.
• An opaque material blocks light completely (e.g.
• Since light travels in straight lines, an opaque object blocks it and casts a shadow.
• The umbra is the full (dark) shadow; the penumbra is the lighter, partial shadow around it.
• A solar eclipse happens when the Moon comes between the Sun and the Earth, casting its shadow on Earth.
• A lunar eclipse happens when the Earth comes between the Sun and the Moon, so Earth's shadow falls on the Moon.
• A pinhole camera forms a real, inverted image because light travels in straight lines through the hole.
• Light travels at about 3 × 10⁸ m/s in a vacuum.
• Parallel rays neither spread out nor come together; they are a parallel beam.
• The Moon shines by reflecting light from the Sun; it does not produce its own light.
• Translucent materials like frosted glass let some light through but scatter it, so objects are not seen clearly.
• Moving the screen further from the source (object fixed near source) enlarges the shadow.
• Light is a form of energy that can travel through a vacuum.
• A small point source gives a sharp, dark shadow (mainly umbra) with well-defined edges.
• The Sun is the Earth's main natural source of light.
• Bringing the object nearer the pinhole produces a larger image on the screen.
• A book does not produce its own light; it is seen by reflected light, so it is non-luminous.
• Each hole forms its own image, so two holes give two (overlapping) images.
• A point source gives a sharp umbra with no penumbra.
• Non-luminous objects reflect light to the eye.
• Wood blocks light completely, so it is opaque.
• Light (3×10⁸ m/s) is far faster than sound (~340 m/s).

Worked examples

Three Light Energy questions with the answer and a short explanation, so you can see how the topic is set before you practise the full set.

How Light Energy is tested in JAMB Physics

Our Light Energy bank holds 40 questions (15 easy, 19 medium, 6 hard). JAMB Physics typically returns to Light Energy year after year, so steady practice on this topic is high-value revision. Questions are multiple-choice with four options, and at UTME pace you get roughly 40 seconds each — which is why timed practice matters.

How to answer Light Energy questions

Work the stem first and predict the answer before you look at the options; then eliminate the ones that contradict the key facts above. Watch for “which is not…”, “all of the above” and “except” style stems, which are where rushed candidates lose easy marks on Light Energy. If a calculation or a precise definition is involved, work it from first principles rather than guessing from a half-remembered rule. When two options look right, re-read the stem for the qualifier that separates them — JAMB rarely repeats an option by accident. If you are still unsure, eliminate the two weakest choices to lift your odds, flag the question, and move on; never burn a full minute on one Physics item when the exam gives you about forty seconds each. Then come back to flagged questions with whatever time remains. The single most reliable way to get faster at Light Energy is repeated timed practice, so use the button above until the recurring patterns feel automatic.

Common mistakes to avoid in Light Energy

The errors that cost marks on Light Energy are usually careless rather than conceptual: misreading a negative stem, confusing two similar terms, or rushing a definition you actually know. Candidates also over-rely on “expo” and last-minute cramming instead of understanding the topic — which fails the moment JAMB rephrases a familiar idea. Treat every option as a claim to be checked against the facts above, keep your working tidy for any calculation, and don’t change a considered answer on a hunch. Above all, revise Light Energy actively by answering questions, not just by re-reading notes — recall under time is what the exam rewards.

Frequently asked questions

Is Light Energy part of the JAMB Physics syllabus?

Yes. Light Energy is a recognised topic in the JAMB Physics syllabus, covering explain rectilinear propagation of light and luminous/non-luminous, transparent/opaque objects. You should be able to recall its key facts and apply them to multiple-choice questions.

How many Light Energy questions can I practise on Belmadeng?

There are 40 original, JAMB-standard Light Energy questions in our free bank, each with the correct answer and a worked explanation. You can practise them untimed or as a timed test.

What are the most important points to know about Light Energy?

Light is a form of energy that travels in straight lines (rectilinear propagation) at about 3 × 10⁸ m/s in a vacuum. Luminous objects make their own light (Sun, lamp); non-luminous objects (Moon, a book) are seen by reflected light. Materials are transparent (clear glass), translucent (frosted glass…

How do I answer Light Energy questions quickly in JAMB?

Read the stem carefully, eliminate clearly wrong options, and match the remaining choices to the key facts for Light Energy. Practising timed Light Energy questions builds the speed you need for UTME's pace of about 40 seconds per question.

Are these JAMB Physics Light Energy questions past questions or original?

They are original questions written to JAMB (UTME) standard and mapped to the official syllabus — not reproduced past papers. This keeps them legal to use freely while closely mirroring how the real exam tests the topic.

Where can I practise Light Energy questions free without signing up?

Right here — tap “Start Light Energy practice” on this page to begin instantly. Belmadeng's CBT practice is completely free and needs no sign-up, download or subscription.

About these questions: original, JAMB-standard items written from the official UTME Physics syllabus (last reviewed 2026-09-18). Belmadeng is an independent study platform and is not affiliated with JAMB. Spotted an error? Use the report link.