10 questions · Form 1 Science Bab 8: Light and Optics
Which optical phenomenon explains why a straight drinking straw appears bent when placed in a glass of water?
Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.
1. Which optical phenomenon explains why a straight drinking straw appears bent when placed in a glass of water?
Answer: B
Refraction occurs because light rays change speed and direction when passing between water and air.
2. Which optical device uses two plane mirrors angled at 45° to allow periscope viewing over obstacles?
Answer: C
Periscopes utilize two parallel plane mirrors fixed at 45° to reflect images over obstacles or around corners.
3. Which tool is used by dentists to view enlarged virtual images of a patient's back teeth?
Answer: B
When an object is placed close to a concave mirror, it produces an enlarged, upright, virtual image.
4. Which color filter allows only Red light to pass through while absorbing Green and Blue light?
Answer: B
A primary Red filter absorbs all visible wavelengths except red light.
5. What color light is produced when equal intensities of Red, Green, and Blue light overlap?
Answer: D
Red, Green, and Blue are the three primary colors of light. Mixing all three equally produces white light.
6. What happens to a light ray when it passes diagonally from air into a dense glass block?
Answer: B
When entering an optically denser medium like glass, light slows down and bends towards the normal line.
7. Why does the clear daytime sky appear blue to an observer on Earth?
Answer: B
Light scattering causes short-wavelength blue light to hit gas molecules in the upper atmosphere and scatter everywhere.
8. Which type of mirror provides a wide field of view and is commonly placed at sharp road corners and in retail security displays?
Answer: C
Convex mirrors curve outward, diverging light rays to provide a wider field of view with diminished, upright virtual images.
9. Which primary colors of light must be combined in equal intensity to produce Magenta light?
Answer: C
Combining Red light and Blue light creates the secondary color Magenta.
10. How does light travel through a uniform homogeneous medium such as air?
Answer: B
Light exhibits rectilinear propagation, meaning it travels in straight lines through uniform media.