Catching Waves 🌊
Sitting right in the middle of the EM spectrum, this is the only type of electromagnetic radiation that human eyes can detect.
What is Visible Light?
A textbook, a tree, and the moon cannot produce their own light, meaning they belong to this category of objects.
What are Non-Luminous objects?
According to the Law of Reflection, the angle of incidence is always equal to this.
What is the angle of reflection?
The bending or change in direction of light when it travels from one medium into another.
What is Refraction?
lens that is physically thicker in the middle and thinner at the edges is called this.
What is a Converging Lens?
These waves have enough energy to pass through human tissue but are stopped by bone, making them perfect for medical imaging and airport baggage screening.
What are X-rays?
When an electric current is passed through different gases, it produces different colours (like Neon glowing red). A dramatic natural example of this electric discharge is this weather phenomenon.
What is Lightning?
When you look in a flat mirror, your right hand looks like your left hand. This apparent "backwards" flipping is called this.
What is Lateral Inversion?
When light travels from a "fast" medium like air into a "slow" medium like water, the light ray will bend in this direction.
What is toward the normal?
n the magnification equation (M = -di / do), if your final magnification is a negative number, it guarantees your image has this attitude.
What is Inverted?
While they are famous for heating up your leftover pizza, these waves are also used for radar and communicating with cell towers.
What are Microwaves?
Because chemiluminescence produces a direct chemical reaction with almost zero heat loss, it has earned this two-word nickname.
What is "Cold Light"?
This type of curved mirror bulges outward and is often used for security in convenience stores.
What is a Convex/Diverging Mirror?
Because our brains always assume light travels in a straight line, looking into a pond makes a fish appear to be here relative to its actual location.
What is shallower (or higher/closer to the surface)?
When plugging numbers into the thin lens equation (1/f = 1/do + 1/di), a diverging lens must ALWAYS be assigned this type of number for its focal length.
What is a negative number?
Though Earth only captures a small fraction of the Sun's energy, it provides the light necessary for this vital biological process in plants.
What is Photosynthesis?
Compact Fluorescent Lights (CFLs) are incredibly energy-efficient, but they must be taken to special recycling centers because they contain this hazardous element.
What is Mercury?
Between concave and convex mirrors, this is the only type capable of projecting a "Real" image onto a screen.
Answer: What is a Concave/Converging mirror?
Total Internal Reflection (TIR) can only happen if light travels from a slow medium to a fast medium, AND the angle of incidence is greater than this specific angle.
What is the Critical Angle?
If a toy car is 4 cm tall (ho), and a lens gives it a magnification (M) of 3, this will be the final height of the image (hi).
What is 12 cm?
With the shortest wavelength and the highest frequency, these extremely energetic waves are used in cancer treatments.
What are Gamma Rays?
As an object undergoes incandescence and gets hotter, the colour of light it produces changes. It starts as red, moves to orange and yellow, and eventually reaches this colour when it is at its hottest.
What is Bluish-White?
If you place an object exactly on the Principal Focus (F) of a concave mirror, this is the kind of image you will get.
Answer: What is no image at all?
The Apollo astronauts left these specific devices on the moon, which use Total Internal Reflection to bounce a laser directly back to Earth to measure distance.
What are Retroreflectors?
A converging lens has a focal length 10 cm. A candle is placed 15 cm away (do). By using the thin lens equation, you find that the image distance (di) is located exactly this far away.
What is 30 cm?