The graph betwene `P` and `V` at constant temperature should look like

Graph between p and V at constant temperature is

The slope of the graph between log P and log V at constant temperature for a given mass of gas is

The slope of the graph between log P and log V at constant temperature for a given mass of gas is

What is the type of graph between log P and log V at constant temperature?

A student measures the focal length of a convex lens by putting an object pin at a distance u from the lens and measuring the distance v of the image pin. The graph between u and v plotted by the student should look like

A student measures the focal length of a convex lens by putting an object pin at a distance u from the lens and measuring the distance v of the image pin. The graph between u and v plotted by the student should look like