Ray model of light Flashcards
What is a property of light?
Light travels in straight lines
What are the three types of beams of light?
Divergent beam
Convergent beam
Parallel beam
What is a Divergent beam?
It is a light ray that spreads out over a larger area from a light source
What is a Convergent beam?
It’s light rays that move towards a focal point
What is a Parallel beam?
It is light rays that travel parallel to each other
What is a reflection of light?
The reflection of light is the bouncing of light rays when they hit an object
What are the terms in a reflection in light?
Normal
Incident ray
reflected ray
Angle of incidence
Angle of reflection
What is a normal in a reflection of light?
It is a line drawn at a right angle to the mirror surface, where the incident ray strikes
What is an incident ray in a reflection of light?
It is a light ray that strikes a reflecting surface
What is a reflected ray in a reflection of light?
It is a light ray that travels away from a reflecting surface after bouncing off
What is an angle of incidence in a reflection of light?
It is the angle between the incident ray and normal
What is an angle of reflection in a reflection of light?
It is the angle between the reflected ray and the normal
What are the 2 laws of reflection?
-The incident ray, reflected ray and normal at the point of incidence lie on the same place
-The angle of incidence is equal to the angle of reflection
What are the two types of objects?
Luminous objects
Non-luminous objects
What are the three types of mirrors?
Plane
Convex
Concave
What does the image formed on a plane mirror look like?
Same size
Upright
Virtual
What does the image formed on a convex mirror look like?
Diminished (becomes smaller)
Upright
Virtual
What does the image formed on a concave mirror look like?
Magnified (becomes bigger)
Upright
Virtual
What does a plane mirror look like?
It has a flat and smooth reflecting surface
What does a convex mirror look like?
-It has a reflecting surface that curves outward
-It spreads out light rays
What does a concave mirror look like?
-It has a reflecting surface that curves inwards
-They focus the light rays on a point in front of the mirror
What are some characteristics when a light is refracted?
-Light can pass through transparent objects
-Light can travel at different speeds due to different optical densities of the object
What are the terms in the refraction of light?
Normal
Incident ray
Refracted ray
Angle of incidence
Angle of refraction
What is a normal in a refraction of light?
A line drawn at a right angle to the surface of a medium where the incident ray strikes
What is an incident ray in a refraction of light?
A light ray which strikes a surface
What is a refracted ray in a refraction of light?
A light ray which undergoes a change in speed
What is the angle of incidence in a refraction of light?
The angle between the incident ray and the normal
What is the angle of refraction in a refraction of light?
The angle between the refracted ray and the normal
Generally, list the states of matter by how optically dense they are from the least to the most optically dense
Gas, liquid, solid
What is the emergent ray?
It a ray of light when a refracted ray emerges into the original object
What is perceived depth?
It is the distance of the image from the surface of water
List, from top to bottom, how would a spectrum be seen in an upright prism
Red
Orange
Yellow
Green
Blue
Indigo
Violet
What are the types of radiation?
Visible light
Ultraviolet radiation
Infrared radiatiom
How does visible light impact us?
-Allows plants to carry out photosynthesis to convert carbon dioxide and water into sugars
-Allows us to see things around us
How does Ultraviolet radiation affect us?
-Exposure to a small amount of Uv radiation encourages our skin to make vitamin D
-Used to treat babies with certain medical conditions
-An environmentally friendly way to sterilize water, food and medical equipment without using or producing harmful chemicals
How does Infrared radiation affect us?
-Infrared technology is useful in healthcare, such as screening people for fever in airports and hospitals
What are the harmful effects of Visible light?
-Causes chemical changes in some materials, leading to the deterioration of their quality
-Causes light pollution due to excessive artificial light in the surroundings, threatening the lives of animals that use the natural day and night cycles for survival
What are the harmful effects of Ultraviolet radiation?
Overexposure to UV radiation can harm our eyes and cause skin cancer
What are the harmful effects of Infrared radiation?
-Overexposure to infrared radiation can damage the eyes and skin
-Infrared radiation trapped in the atmosphere can cause climate change, leading to an increase in Earth’s temperature and changing weather patterns that can harm living things
