What this check covers: A short sample of the Light syllabus. It doesn't count towards mastery. Your answers show what to practise next.
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From which line are the angles of incidence and reflection measured?
the normal at the point of incidence the reflecting surface the incident ray the reflected ray Which statement correctly gives the law relating incidence and reflection angles?
angle of reflection is twice the angle of incidence angle of incidence equals angle of reflection, i = r angle of incidence plus angle of reflection equals 90° angle of incidence equals angle of refraction How does light bend when it enters a slower medium obliquely?
without changing direction at any incidence angle towards the normal away from the normal along the boundary For light of one colour passing obliquely from medium P into medium Q, which ratio stays constant as the angles of incidence i and refraction r change?
sin i / sin r i / r sin r / cos i sin i × sin r Define refractive index using light speeds.
n = v/c, medium speed divided by vacuum speed n = cv, the product of the two speeds n = c − v, the difference between the speeds n = c/v, vacuum speed divided by speed in the medium A narrow beam travels parallel to the principal axis towards a thin converging lens. What happens to the rays?
It leaves every ray parallel and undeviated. It reflects the rays back to the source. It refracts the rays to the principal focus on the far side. It spreads the rays from the principal focus on the near side. Define focal length for a thin converging lens.
the diameter of the lens through its optical centre the distance from the optical centre to the principal focus the distance from the object to the image the distance between the two principal foci What is the critical angle?
the incidence angle at which all light is absorbed the angle between the boundary and normal the incidence angle in the denser medium that produces a 90° refracted ray the refraction angle in the less dense medium that produces a 90° incident ray How is light guided along an optical fibre?
repeated refraction out through the cladding absorption and re-emission by the core electrical conduction along the glass repeated total internal reflection at the core boundary An object is placed 15 cm from a thin converging lens of focal length 10 cm. A ray parallel to the principal axis and a ray through the optical centre are drawn to locate the image. Which describes the image?
Beyond 20 cm on the far side of the lens; real, inverted and magnified Between 10 cm and 20 cm on the far side of the lens; real, inverted and diminished On the same side as the object; virtual, upright and magnified At 20 cm on the far side of the lens; real, inverted and the same size
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Try again Questions are picked at random each time you start. You'll see the answer after each question. It's for practice only and doesn't count towards mastery.
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Recent attempts History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Previous question Go to question Next question Practice complete
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Finish and submit Time is up, but your answers have not been submitted yet. Check your connection and try again.
Try again Answer 11 questions. You'll see your score, the answers and explanations at the end. Your result can count towards your course progress.
Check my progress Continue my progress check
Recent attempts History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
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This assessment needs JavaScript. Its questions are chosen when you start an attempt, so they cannot be listed here.
Finish and submit Time is up, but your answers have not been submitted yet. Check your connection and try again.
Try again Answer 11 questions. You'll see your score, the answers and explanations at the end. Your result can count towards your course progress.
Check again Continue checking again
Recent attempts History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
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This assessment needs JavaScript. Its questions are chosen when you start an attempt, so they cannot be listed here.
Finish and submit Time is up, but your answers have not been submitted yet. Check your connection and try again.
Try again Answer 11 questions. You'll see your score, the answers and explanations at the end. A scheduled review counts towards your course progress only when it is due.
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Recent attempts History is stored only in this browser.
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Beyond the syllabus: optional enrichment that does not count towards your progress.
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