A small light-bulb is around 1.02 m from a screen.
i) When you have a convex lens having 15 cm focal length, where are the two lens positions that will project an image of the light-bulb onto the screen? Deduce your answers by employing two significant figures separated by a comma.
ii) Determine the magnification in the first case (smaller distance from the light bulb)?
iii) Determine the magnification in the second case (greater distance from the light bulb)?