chapter 5 (ray model of light) Flashcards
What is light that travels in straight line paths called?
Rays.
What are all the properties of light?
Light travels in straight lines
Light cannot bend
What is a luminous object?
A object that emits light on its on.
What is a non-luminous object?
A object that do not emit its own light, and can only be seen in the presence of a light source.
What is the process of a light ray bouncing off a surface called?
Reflection.
How are we able to see objects that do not emit their own light?
Light rays from another light source bounce off the surface of the object, reflecting it into our eyes.
What are the characteristics of the image made in a mirror?
- Same size as the object
- Upright
- Virtual
- Laterally inverted
What is the meaning of “laterally inverted”?
It means that the left and right sides of a image are reversed.
Will the distance between the object and the mirror be the same as the distance of the image made from the mirror to the mirror?
Yes.
What are the parts of the ray model of light?
- The normal
- The incidence ray
- The reflected ray
- The angle of incidence
5, The angle of reflection
What is the normal in a ray model of light?
It is the line perpendicular to the surface at the point of incidence.
What is the incident ray in the ray model of light?
It is the light ray hitting the surface.
What is the reflected ray in the ray model of light?
It is the light ray travelling away from the reflective surface after bouncing off the surface.
What is the angle of incidence in the ray model of light?
It is the angle between the incident ray and the normal.
What is the angle of reflection?
It is the angle between the reflected ray and the normal.
What is the law of reflection?
Angle of incidence = angle of reflection
What are the three different types of mirrors?
- Plane mirror
- Convex mirror
- Concave mirror
Which direction does a convex mirror curve? What type of image does it create?
Outwards. It creates smaller images, virtual, upright, and diminished. It creates a wider field of vision.
What direction do concave mirrors face? What kind of image do they produce?
They face inwards. They create bigger, enlarged and magnified images.
What happens when parallel rays of light fall onto a smooth surface?
Each light ray is reflected in the same direction.
What happens when parallel rays of light fall onto a non-smooth surface?
Each ray is reflected in a different direction.
What is refraction?
Refraction is the bending of light at the boundary between two transparent materials (optical mediums) due to a change in the speed of light as it passes from one material into the other.
What affects the speed of light that travels through the medium in refraction?
Optical density.
What colours make up the rainbow?
Red, orange, yellow, green, blue, indigo violet (ROYGBIV)
What colour in the rainbow bends the most and least?
Violet bends most, red bends the least.
What is the splitting of white light into different colours called?
Dispersion.
What can infrared technology help us with? What are its harmful effects?
Medical purposes like taking temperature (thermal cameras). Overexposure to infrared light can cause climate change.
What can ultraviolet light do? What are its harmful effects?
UV sterilisation can disinfect things without using harmful chemicals or releasing harmful by-products. Overexposure to UV radiation can harm eyes and cause skin cancer.
What are some harmful effects of visible light?
Chemical changes in some materials, light pollution (too much artificial light in the environment).
