Bending Beams
Light bends when it moves between materials of different optical density. Name this process.
Refraction
Name the lens that brings parallel rays to a focal point.
Convex lens
Instrument that magnifies distant objects using lenses or mirrors.
Telescope
Part of the eye that changes shape to focus light.
Lens
Lighting advice for reading to reduce eye strain.
Use bright, even light without glare.
White light spreads into a spectrum in a prism because wavelengths travel at different speeds. Name this effect.
Dispersion
How can you find the focal length of a thin lens?
Focus a distant object on a screen and measure the distance from the lens to the screen.
Why does a camera aperture work like the human pupil?
Both control the amount of light entering.
Why does your pupil get smaller in bright sunlight?
To limit the amount of light entering the eye and protect the retina.
Device used to measure illuminance.
Lux meter
Why does a pencil look bent in a glass of water?
Light changes speed and direction when passing from air to water.
Where is the object when the image from a convex lens virtual and upright?
When the object is inside the focal length.
How does a microscope create a magnified image?
The objective lens makes a real image; the eyepiece enlarges it.
What is the purpose of your optic nerve
To send messages back to your brain
Why is high screen brightness in a dark room harmful?
Causes eye strain from constant pupil adjustment.
Explain why a rainbow appears after rainfall even when the sun is shining.
Raindrops refract, reflect, and disperse sunlight into different wavelengths, creating a visible spectrum.
A projector uses a convex lens to display an image on a screen. Explain how the image is formed and oriented.
The lens projects a real, inverted, and magnified image of the object (film or slide) onto the screen.
Explain how binoculars work
They use prisms to flip the inverted image
Main difference between how a camera focuses and how the eye focuses.
Camera moves the lens; eye changes the lens shape.
Why do movie theaters keep the lighting dim even before the film starts?
Dim light helps eyes adapt to low-light conditions for better screen visibility
Why does violet light bend more than red light in a prism?
Violet light has a shorter wavelength and higher refractive index.
Difference between a magnified and a reduced image through the same convex lens.
Magnified: object close to lens; Reduced: object far from lens.
What causes chromatic aberration in a lens?
Different wavelengths refract at different angles.
Why does vision shift from cones to rods in low light?
Rods are more sensitive to dim light but don’t detect color.
Why does teacher simmona shut off the front two lights when she reviews slides? :D
To reduce glare and improve contrast