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Quiz Chapter 8: Light and Optics

10 questions · Form 1 Science Bab 8: Light and Optics

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. What is the imaginary line drawn perpendicular (90°) to a reflecting surface at the point of incidence called?

  1. Incident ray
  2. Reflected ray
  3. Normal line
  4. Focal axis
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Answer: C

The normal line is a line drawn perpendicular (90°) to the reflecting or refracting surface.

2. How does light travel through a uniform homogeneous medium such as air?

  1. In circular loops
  2. In straight lines
  3. In unpredictable zig-zag paths
  4. In continuous sine waves
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Answer: B

Light exhibits rectilinear propagation, meaning it travels in straight lines through uniform media.

3. If an incident ray strikes a flat mirror surface at an angle of incidence equal to 35°, what is the angle of reflection?

  1. 35°
  2. 55°
  3. 70°
  4. 90°
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Answer: A

According to the Law of Reflection, the angle of incidence (i) is always equal to the angle of reflection (r).

4. Why does the clear daytime sky appear blue to an observer on Earth?

  1. Blue light is absorbed completely by the ozone layer
  2. Fine atmospheric gas molecules scatter short-wavelength blue light in all directions
  3. Seawater reflects its blue color directly into the sky
  4. Red and yellow light bend away into deep space
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Answer: B

Light scattering causes short-wavelength blue light to hit gas molecules in the upper atmosphere and scatter everywhere.

5. Which optical phenomenon explains why a straight drinking straw appears bent when placed in a glass of water?

  1. Reflection
  2. Refraction
  3. Dispersion
  4. Scattering
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Answer: B

Refraction occurs because light rays change speed and direction when passing between water and air.

6. Which primary colors of light must be combined in equal intensity to produce Magenta light?

  1. Red and Green
  2. Green and Blue
  3. Red and Blue
  4. Yellow and Cyan
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Answer: C

Combining Red light and Blue light creates the secondary color Magenta.

7. What happens to a light ray when it passes diagonally from air into a dense glass block?

  1. It speeds up and bends away from the normal line
  2. It slows down and bends towards the normal line
  3. It travels in a straight line without changing speed
  4. It stops completely and reflects 100%
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Answer: B

When entering an optically denser medium like glass, light slows down and bends towards the normal line.

8. Why is the word 'AMBULANCE' printed laterally inverted on the front of emergency vehicles?

  1. It is a legal manufacturer requirement
  2. So drivers ahead can read it correctly in their rear-view mirrors
  3. To make it easier for pedestrians to read
  4. To prevent reflection glare from headlights
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Answer: B

Rear-view plane mirrors cause lateral inversion. Printing the text backwards allows drivers ahead to read 'AMBULANCE' correctly.

9. What characteristic describes the image formed by a standard flat plane mirror?

  1. Real, inverted, and enlarged
  2. Virtual, upright, and laterally inverted
  3. Real, upright, and diminished
  4. Virtual, inverted, and same size
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Answer: B

Images in a plane mirror are virtual (cannot be projected on a screen), upright, laterally inverted (left-right reversed), and the same size as the object.

10. What secondary color of light is created by mixing Green light and Blue light?

  1. Magenta
  2. Yellow
  3. Cyan
  4. White
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Answer: C

Mixing Green light and Blue light produces Cyan light.

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