Physics Past Questions and Answers

A simple microscope forms an image twice the size of the object. If the focal length of the lens of the microscope is 20m, how far is the object from the lens?

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

Given that the gravitational constant is 7 X 10^-11 Nm2kg^-2, what is the force of attraction between 10⁶kg mass of lead hanging one metre away from a 10³kg mass of iron?

Calculate the current in the 3Ω resistor shown in
the diagram above.

What is the electric potential energy between two protons each of charge q and at a distance of r apart? (Permittivity of free space = ε_o)