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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. Which optical device uses two plane mirrors angled at 45° to allow periscope viewing over obstacles?

  1. Microscope
  2. Telescope
  3. Periscope
  4. Magnifying glass
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Answer: C

Periscopes utilize two parallel plane mirrors fixed at 45° to reflect images over obstacles or around corners.

2. Which type of mirror provides a wide field of view and is commonly placed at sharp road corners and in retail security displays?

  1. Plane mirror
  2. Concave mirror
  3. Convex mirror
  4. Parabolic mirror
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Answer: C

Convex mirrors curve outward, diverging light rays to provide a wider field of view with diminished, upright virtual images.

3. 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.

4. 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).

5. What color will a pure red apple appear under pure green light?

  1. Red
  2. Green
  3. Yellow
  4. Black
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Answer: D

A red surface only reflects red light and absorbs green light. Under green light alone, no light is reflected, so it appears black.

6. When white light passes through a triangular glass prism, which component color refracts (bends) the most?

  1. Red
  2. Yellow
  3. Green
  4. Violet
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Answer: D

Violet light has the shortest wavelength in the visible spectrum and slows down/bends the most during dispersion.

7. 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.

8. 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.

9. 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.

10. 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.

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