Chapter 5 : Ray Model of Light Flashcards
How do luminous objects allow us to see them?
They emit light in all directions. Light then travels in straight lines from these objects to our eyes. Thus, we are able to see the objects.
Define reflection.
It is the bouncing of light off a surface.
What is the surface of a plane mirror like?
It is smooth and flat.
How many characteristics of plane mirrors are there?
5
What are the 5 characteristics of images formed by plane mirrors?
- The image is the same size as the object.
- The image is upright
- The image is virtual ( the image is formed inside the mirror and thus is unable to be formed on a screen
- The image is laterally inverted (reverses right and left sides of an image)
- The distance between the object and the mirror is the same as the distance between the image and the mirror.
What are the five parts needed to form a ray model of light?
- Incident ray
- Reflected ray
- Normal
- Angle of incidence
- Angle of reflection
What is a special characteristic for the angle of incidence and reflection?
The angle of incidence is always equal to the angle of reflection.
What are the 2 types of curved mirrors?
Concave and Convex mirrors
Convex mirrors curve ______
outwards
Concave mirrors curve ______
inwards
What are the 3 characteristics of images formed by convex mirrors?
- The image is upright
- The image is virtual
- The image is diminished
Convex mirrors provide a _________________________________
a wider field of vision
When are convex mirrors commonly used?
They are commonly used when a large area needs to be seen.
What are the benefits of placing convex mirrors at road junctions?
They allow drivers to see around blind corners, giving them more time to respond to oncoming traffic.
What are the benefits of installing convex mirrors at the corner of some shops?
They allow shopkeepers to see a large area from a single location.
What are the benefits of using convex mirrors as rear and side view mirrors of cars?
They enable drivers to see a large area of the traffic behind them.
What are the 3 characteristics of images formed by concave mirrors?
- The image is upright
- The image is virtual
- The image is magnified
What are the benefits of using a concave mirror as a dentist mirror?
They allow dentists to examine the teeth closely.
What are the benefits of using a concave mirror as cosmetic mirror?
It forms a magnified image of our face, allowing us to shave or apply make-up more easily
What are the benefits of using concave mirrors in the headlights of a car?
They reflect the light from the bulbs in the headlights to form strong beams of light, thus lighting up the road ahead.
What are the benefits of placing a concave mirror at the base of a microscope?
It reflects light from the lamp of the microscope to a specimen, allowing us to view the magnified image of the specimen.
How is each light ray reflected when they fall on a smooth surface?
When parallel rays of light fall on a smooth surface, each ray is reflected in the same direction.
_____ images are formed when reflection on smooth surfaces occurs.
Clear
How is each light ray reflected when they fall on a rough surface?
When parallel rays of light fall on a rough surface, each ray is reflected in a different direction.