Here is the ray diagram summary for objects closer than 1 focal length in ipod video format.
mrmackenzie
ray diagram – object closer than 1f
This post is for Standard Grade and Intermediate 2.
Here we consider an object closer than one focal length. You will see that it is not possible to obtain a real image when the object is this close to the lens. On a ray diagram, a real image is one that is found on the other side of the lens from the object.
Real images can always be displayed on a screen – a projector in the cinema or classroom produces a real image. If you are doing an experiment, you can check to see if an image is real using a piece of paper. Move your sheet of paper closer to and further from the lens – if you can’t get an image to form on the paper then the image must be virtual. When we look at an object up close through a magnifying glass, we see a virtual image.
ray diagram for objects closer than 1f from mr mackenzie on Vimeo.
ray diagrams – ipod version
Here is the first ray diagram video formatted for ipod.
how to draw a ray diagram
If you are sitting Credit Standard Grade or Intermediate 2 you should be able to draw a ray diagram for a convex lens.
At Standard Grade you must be able to draw this diagram for a magnifying glass. A video for this will be posted shortly.
Intermediate 2 candidates may be asked to draw the diagram for an object placed
- closer than one focal length
- between one and two focal lengths
- more than two focal lengths
from the convex lens. I will post a video showing each of these three situations.
Let’s start with an introduction to drawing ray diagrams. This video looks at an object between one and two focal lengths from the lens. It will show you how to draw the diagram and explain the terms we use to describe the image.
how to draw a ray diagram from mr mackenzie on Vimeo.
Disclaimer: No rabbits were harmed in the making of this video.
1992 Higher paper I
I’ve had a request to include the old multiple choice papers in this series of posts. Here is paper I from 1992, there are some written questions at the end of the paper.
There is a complete set of answers for this paper here.
This paper is reproduced to support SQA qualifications on a non-commercial basis according to SQA conditions of use.
Higher 1999 paper II
Here is the 1999 paper.
There is a complete set of answers for this paper here.
This paper is reproduced to support SQA qualifications on a non-commercial basis according to SQA conditions of use.
bad particle physics
The Large Hadron Collider never seems to be out of the news for long, so it makes sense for someone to provide something for non-physicists to help them understand some of the language of particle physics.
Well done to Reuters, who published a short article called Factbox: Glossary of particle physics terms last week. Unfortunately, it’s not entirely correct. Follow the link above and use your knowledge of particle physics from unit 2 of the AH Physics course to correct the errors. It’s always possible that Reuters might pull the article due to the errors so I have attached a pdf of the page below, no excuses!
Thanks to Zapperz for his original post about the article.
Higher 1998 paper II
The 1998 written paper is attached.
There is a complete set of answers for this paper here.
This paper is reproduced to support SQA qualifications on a non-commercial basis according to SQA conditions of use.
Higher 1997 paper II
This is the 1997 written paper.
There is a complete set of answers for this paper here.
This paper is reproduced to support SQA qualifications on a non-commercial basis according to SQA conditions of use.
how do you eat yours?
More fun from the people at Nottingham University. Happy Easter!