5 ray model of light Flashcards
Characteristics of a plane mirror
-The image is of the same size of the object
-The image is upright
-The image is laterally inverted
-The distance between the image and the mirror is equal to the distance between the object and the mirror.
Convex mirror characteristics
**The image formed is smaller than the object.
They provide a wide field of vision.
The image is formed behind the convex mirror.
The image is an upright and erect image.
It has a curve outward
Characteristics of a concave mirror
It has a curve inward (bc they cave in)
They are commonly used when a magnified image is needed.
Uses for convex mirrors
Convex mirrors can be found at road junctions to allow drivers to see around blind corners, giving them more time to respond to oncoming traffic
They are also installed at corners of shops to allow shopkeepers to see a large area of the shop in a single location.
Concave mirror uses
Dentists use concave mirrors to form a magnified image of the teeth, it allows them to examine the teeth closely
Most optically dense to least optically dense is…
Glass, water, air
Does the ray of light bend towards the normal or away from the normal if the ray of light is travelling from an optically less dense to an optically denser environment?
It slows down and bends towards the normal.
Does the ray of light bend towards the normal or away from the normal if the ray of light is travelling from an optically denser to an optically less dense environment?
Its speed increases and bends away from the normal.
White light is made of 7 colours. Name them
Red, yellow, orange, yellow, green, blue, indigo, violet.
Since red light travels the fastest, does it bend the most or does it bend the least?
Bends the least
Since violet travels the slowest, does it bend the most or bend the least?
It bends the most
What is the relationship between the angle of incidence and the angle of reflection?
The angle of reflection is equal to the angle of incidence.
*what is reflection
the bouncing of light off a surface
light does not pass through a reflecting surface
What is the process called when white light is split into the 7 primary colours?
Dispersion
*what is refraction
it is the bending effect of light when the light ray changes speed as it travels into one optical medium to another
How do you draw the image of reflected rays?
- locate the image (image dist. = object dist.)
- draw reflected ray (image to eye)
- draw incident ray (object to point of incidence)
where does the light bend from the normal when it passes through
1. from air to glass
2. from glass to air
3. from air to water
- The light bend towards the normal as glass is optically more dense than air
- the light bends away from the normal as air is optically less dense than glass
- the light bends towards
what are luminous objects, some examples and how do we see them?
They are objects that give off light
examples; fire, sun, working light bulb
light from the luminous objects enters our eyes
what are non-luminous objects, some examples and how do we see them?
they are objects that do not give off light
almost ever other object, eg; pen, bottle, wallet etc
light from luminous objects reflect off non-luminous objects and enters eyes.
what is the incident ray and the angle of incidence?
the incident ray is the light ray hitting the reflecting surface
the angle of incidence is the angle between the incident ray and the normal
what is the reflected ray and the angle of reflection?
the reflected ray is the light travelling away from the reflecting surface after bouncing off the surface
the angle of reflection is the angle between the normal and the reflected ray
*What are the effects of refraction?
Refraction makes object look closer than they are
**What is dispersion and why does it occur
dispersion is when white light is split into seven primary colours
the prism refracts lights of different colours by different angles, due to the light of each colour travelling at a different speed in the prism
What are the applications of infrared radiation and it’s cons
It can be used in healthcare, devices such as thermal imaging cameras can screen people for fever
it contributes to climate change
** explain how the smooth surface of a plane mirror allows a clear image to be formed
Parallel rays reflect in the same direction when bounced off a smooth surface, thus forming an image
** explain why rough surfaces are unable to form images
since the rough surface scatters light, the image is unable to be formed
