Please help with the following physics questions

SECTION B: LIGHT & MODERN PHYSICS 5. (a) Show clearly by means of ray diagrams how a concave mirror produces 1) an upright image. ii) an inverted image. [6] (b) Find the size and the position of the image of an object 5cm high placed 120cm from a convex mirror with a focal length of magnitude 40cm. 141 (c) Figure 5.1 shows a plastic lens of refractive index 1.50, having a convex surface of radius 20cm and a concave surface of radius 40cm. Compute the focal length of the lens and state whether it is converging or diverging. 141 20cm -40cm Figure 5.1 (d) An object 2cm high is placed upright on the principal axis 20cm to the left of the lens shown in Figure 5.1. i) Find the position of the image formed by the lens. ii) State the nature of the image. iii) Find the height of the image. [6] 6. (a) Explain what the terms nucleon, atomic number and mass number mean? [3] (b) Discuss what happens to the atomic number and the mass number of an atomic nucleus when it decays by emitting: i) an alpha particle ii) a beta particle. (4] (c) List three properties of nuclei. [3]