Called a straight edge
Sparse ruler
a straightedge
I believe they are called graduations
It is known as a semi-circular protractor.
A ruler can be classed as a straight edge.
find a ruler with decimals.
a bit of plastic
I looks like they are just called 'Ruler Markings', from everything that I can find. That's all I've known them as.
a straightedge
The answer depends on the graduation (markings) on the ruler.
a flat wooden stick
You look at the markings on its edge.
It is between 1.3 and 1.4: nearer to 1.4. It is 1 3/8 if your ruler has markings in eighths.
On a 30cm ruler you can't get it exactly, you need a higher tech ruler which has the markings of 2.54cm. If you have a normal ruler you have to estimate.
That depend on how long the ruler is. The 2 rulers in my desk drawer have 200 and 300 milimeters markings respectively. I also have a triangle with 195 millimeter markings on one side. I just looked in another drawer and found a ruler with 400 mm markinga and a folding carpenter's rule with 2000 markings.
The distance between the 0 and 1 markings on a metric ruler.
It is provided by the markings on a ruler which can be laid along the line.
Magnification is an enlargement of the specimen which looks bigger as the magnification increases. Resolution is the the smallest increment available. The difference between these can be explained with the example of a ruler that has 1/8" markings. Magnification will make the separation of the markings look bigger, but the resolution of the ruler doesn't change, the markings are still 1/8" apart. However, magnification can improve the resolution because you can now see things bigger. For example the separation between the markings of the ruler could be divided down even more under magnification.