All flashcards
Flashcard 1: What happens to visibility when an object absorbs most of the light that hits it?
Answer: It looks darker and is harder to see. Absorbed light doesn't reach our eyes.
Flashcard 2: What is a shadow?
Answer: A dark area where light is blocked by an object. Forms when something blocks light's path.
Flashcard 3: Which color usually reflects more light and is easier to see: white or black?
Answer: White. White surfaces reflect most wavelengths; black absorbs them.
Flashcard 4: What three things must happen for you to see a non-glowing object?
Answer: Light source, light reflects off object, light enters your eyes. These three steps create the path from object to eye.
Flashcard 5: What is reflection in the context of light and visibility?
Answer: Light bouncing off a surface. Light changes direction when it hits a surface.
Flashcard 6: Which type of object can be seen in complete darkness: a lamp or a book?
Answer: A lamp. Lamps produce their own light; books need external light.
Flashcard 7: Which option best describes a light source: the Sun or the Moon?
Answer: The Sun. The Sun generates light; the Moon only reflects it.
Flashcard 8: What is the main reason the Moon is visible at night?
Answer: It reflects sunlight. The Moon doesn't produce light but acts like a giant mirror.
Flashcard 9: What does transparent mean for light and visibility?
Answer: It lets most light pass through; you can see through it. Clear materials allow light to travel straight through.
Flashcard 10: What does translucent mean for light and visibility?
Answer: It lets some light through; objects look blurry. Light scatters as it passes through, causing blur.
Flashcard 11: Which material is most likely translucent: wax paper or clear glass?
Answer: Wax paper. Wax paper scatters light; clear glass doesn't.
Flashcard 12: Which option makes an object easier to see: more light shining on it or less light?
Answer: More light shining on it. More light means more reflection to see.
Flashcard 13: Which option blocks light and reduces visibility: clear air or thick fog?
Answer: Thick fog. Fog particles scatter and absorb light.
Flashcard 14: Which surface reflects more light: a mirror or a black sweater?
Answer: A mirror. Smooth surfaces reflect more light than dark, fuzzy ones.
Flashcard 15: If a book is behind a wall from your viewpoint, what is the best prediction about visibility?
Answer: It will not be visible because the wall blocks the light. Opaque objects block light paths completely.
Flashcard 16: Which option best predicts visibility: a red apple in bright light or in a dark closet?
Answer: In bright light. Light reflects off the apple; darkness provides no light.
Flashcard 17: What does opaque mean for light and visibility?
Answer: It blocks light; you cannot see through it. No light passes through opaque materials.
Flashcard 18: What word describes a material that lets some light through but makes images blurry?
Answer: Translucent. Scatters light particles, creating a foggy appearance.
Flashcard 19: What word describes a material that does not let light pass through so you cannot see through it?
Answer: Opaque. Blocks all light transmission, creating shadows.
Flashcard 20: Which option is most likely to be visible in a completely dark room: a flashlight (on) or a chair?
Answer: A flashlight (on). Only light sources are visible without external illumination.
Flashcard 21: Identify the best prediction: Can you see a chair in a dark room with no light sources present?
Answer: No, the chair will not be visible. Objects need light to reflect; darkness means no visibility.
Flashcard 22: What is reflection?
Answer: The bouncing of light off a surface. Light changes direction when hitting a surface.
Flashcard 23: What word describes a material that lets most light pass through so objects behind it are seen clearly?
Answer: Transparent. Like clear glass, allows light through with minimal distortion.
Flashcard 24: Which option best describes the path of light that lets you see an object: source→object→eye or eye→object→source?
Answer: source→object→eye. Light travels from source to object, then reflects to your eye.
Flashcard 25: What is the difference between a light source and an object that only reflects light?
Answer: A light source makes light; a reflector only bounces light. Sources emit their own light; reflectors need external light.
Flashcard 26: What condition must be true for you to see a non-glowing object such as a book?
Answer: Light must reflect from the object into your eyes. Objects don't emit light; they must reflect it to be seen.
Flashcard 27: Which option best predicts what you can see through: clear glass, wax paper, or cardboard?
Answer: Clear glass: clear view; wax paper: blurry; cardboard: cannot see through. Materials vary from transparent to translucent to opaque.
Flashcard 28: What must be true for you to see your face in a mirror?
Answer: Light must reflect from your face to the mirror, then to your eyes. Mirrors redirect light from objects back to viewers.
Flashcard 29: Which option best predicts visibility: a mirror in a dark room or a mirror with a flashlight shining on it?
Answer: A mirror with a flashlight shining on it. Mirrors need light to reflect; darkness shows nothing.
Flashcard 30: What color will a green leaf most likely appear under green light only?
Answer: Green. Objects appear their color when that color light is present.