1. Light & Optics: Reflection Flashcards
(22 cards)
To investigate how light rays reflect from a concave mirror
Speed of light?
300,000,000 m/s
3 x 108 m/s
Three hundred million meters per second
What is this type of reflection called?
Diffuse Reflection
What is a virtual image?
a virtual image is for example a mirror, light reflecting from plane that will never create a clear image on a screen.
what is a real image?
A real image is for example, we see a real image when we go to the cinema-this is a image that can be formed on a screen.
what are the two types of images
There are two types of images: real and virtual.
What is this kind of reflection called?
Regular Reflection
The laws of reflection ?
🔹 The angle of incidence Equals the Angle of reflection.
🔹The incident ray, the normal and the reflected ray are all in same the plane.
Plane mirror
Parallax
To show that the image distance behind the mirror as the object is in front of it.
To show that thje object distance is equal to the image distance
Investigate reflection from concave mirror.
Real image is created.
- Stand inside window on bright day with concave mirror pointing at your friend outside.
- Light will be reflected onto the wall inside the house.
- It will show a REAL IMAGE of your friend.
To investigate how light reflect from a concave mirror
Light rays reflecting through the focal point
Light rays passing through the focal point
A light ray incident at the pole
Laws of reflection for concave mirrors
It is important to note that the laws of reflection are still being followed when light rays reflect from a concave mirror
How images are formed in a concave mirror: Ray diagrams
Following just those few light rays we can see how images are formed in a concave mirrior, and why we sometimes get magnified images ands sometimes diminished images, and why sometimes the image is inverted and sometimes not. We can also see if the image is going to be real or imaginary.
Relationship between the object and image distances and the focal length of a mirror
If you use a setup like this you should be able to move the screen and the mirror in such a way that a clear (real)image is seen on the screen.
Virtual lengths
When you have studied physics, particularly the area of mechanics, you will see that when we use mathematical formulae to analyse real, physical, situations we frequently come across negative values.
