Podcast
Questions and Answers
Objects that produce their own light are called ______ objects.
Objects that produce their own light are called ______ objects.
luminous
Light travels in ______ lines.
Light travels in ______ lines.
straight
When light enters a glass block, it ______ down.
When light enters a glass block, it ______ down.
slows
The angle of incidence equals the angle of ______.
The angle of incidence equals the angle of ______.
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In a plane mirror, the image formed is ______, meaning it cannot be projected onto a screen.
In a plane mirror, the image formed is ______, meaning it cannot be projected onto a screen.
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Study Notes
Light
- Objects that emit light are called luminous.
- Most objects are non-luminous; we see them by reflected light.
- Light travels through transparent materials.
- Light is scattered in translucent materials.
- Light is absorbed by opaque materials.
- Shadows demonstrate that light travels in straight lines.
- The speed of light in a vacuum is 300,000,000 m/s.
Images in Plane Mirrors
- Looking in a mirror creates an image.
- The image in a plane mirror is virtual.
- The image is the same size as the object.
- The image is located as far behind the mirror as the object is in front.
Reflection
- The imaginary line perpendicular to a mirror is the normal.
- Angles of reflection are measured from the normal.
- The angle of incidence equals the angle of reflection (law of reflection).
- Specular reflection occurs from smooth surfaces.
- Diffuse reflection occurs from rough surfaces.
Refraction
- Light slows down when entering a glass block.
- This can cause a change in direction.
- Light bends towards the normal when entering glass and bends away from the normal when leaving.
- The bending of light explains why objects in water or at the bottom of a pool appear closer than they actually are.
- Lenses and prisms also bend light.
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Description
This quiz covers fundamental concepts related to light, including luminous and non-luminous objects, the behavior of light in mirrors, and the principles of reflection and refraction. Test your understanding of how light interacts with different materials and its properties such as speed and image formation.
