How we see things
Lesson 4 / 8
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Waxaan sharxi karaa sida aan wax u aragno iyada oo la adeegsanayo indhaha.
Introduction
In this lesson: I can explain how we see objects around us using our eyes. Luminous objects give out light, non–luminous objects do not. All surfaces reflect light. Mirror–like surfaces reflect light in a regular way, other surfaces scatter light.
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Quizzes
1. Which of the following words is the opposite of ‘smooth’?
- bright
- Correct answer:rough
- shiny
- dark
2. Which of the following words is the opposite of ‘shiny’?
- sticky
- dark
- black
- Correct answer:dull
3. Which of the following statements about light rays are correct?
- Correct answer:They are a way of modelling light.
- Correct answer:They point in the direction the light travels.
- A very thin beam of light can be made of only one ray.
4. The first law of reflection states that the angle of reflection equals …
- Correct answer:the angle of incidence.
- a right angle.
- the incident ray.
- the reflected ray.
5. The second law of reflection states that the incident ray and the reflected ray are …
- along the normal.
- Correct answer:on opposite sides of the normal.
- on the same side of the normal.
6. The third law of reflection states that the two rays and the normal are all …
- in different directions.
- along the same line.
- Correct answer:in the same plane.
- in different planes.
1. Which of the following objects are luminous?
- mirror
- Correct answer:fire
- Correct answer:torch
- water
2. Three pupils make statements A, B and C. A: only white objects reflect. B: only shiny objects reflect. C: you can see yourself in any object that reflects. How many of the statements are correct?
- Correct answer:none of them
- one
- two
- three
3. Which of the following statements describes when light obeys the laws of reflection?
- When light of any colour reflects off a smooth object.
- Correct answer:When light of any colour reflects off any object.
- When white light reflects off a smooth object.
- When white light reflects off any object.
4. Which of the following is a definition for the pupil of the eye?
- A hole in the back of the eye that lets light out.
- Correct answer:A hole in the front of the eye that lets light in.
- The coloured part of the front of the eye.
- The white part of the front of the eye.
5. A pupil shines a laser beam onto a wall. They can see a spot of light where the beam hits the wall, but cannot see the beam as it travels to the wall. Which of the following statements explains why?
- Light travels too fast for you to see it.
- You can only ever see light after it has reflected.
- Correct answer:There is nothing in the air for the light to reflect off.
- Light jumps straight from the laser to the wall without travelling between them.
What pupils see
The same lesson as a pupil sees it. You can set any section as work on its own.
- IntroductionPrepare
- Starter quizActivate · 6 questions
- Lesson videoLearn
- Exit quizCheck · 5 questions