Light Flashcards
What are the 2 key properties of light
- It travels in a straight line
- When blocked it causes a shadow to be formed
What is the definition of reflection
The bouncing of light off a surface
What are the properties of a plane mirror
- The image is the same size as the object
- The image is upright
- The image is virtual
- The image is laterally inverted
- Same distance between the mirror and object/image
Uses of plane mirror
Periscope and mirrors to check one’s appearance
What are the properties of a concave mirror
- Bends inward
- The image is virtual
- The image is magnified
- The image is upright
What are the uses of a concave mirror
Dentist and microscopes
What are the properties of a convex mirror
- It bends outward
- Smaller
- Larger field of view
- The image is upright
- The image is virtual
What is the definition of refraction
The bending of light at the boundary of two different optical mediums
Order of optical density (least to most)
- Gas
- Liquid
- Solid
What happens to light when it enters water from the air
Light slows down and bends toward the normal
What is the order of dispersion of light
- Red
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet
(violet bending the most and red bending the least)
What is infrared radiation applications
TV remotes, temperature screening devices
What is Electromagnetic radiation
Radiations other than light that is not visible to the human eye
What are the harmful effects of infrared radiation
- Overexposure can harm eyes
- Causes climate change when infrared radiation is trapped in the atmosphere
Application of UV radiation
- Used in the treatment of skin diseases
- used in the sterilisation of medical instruments
