The objective and eyepiece of the compound microscope in the figure below are both converging lenses and have focal lengths of fo = 15.0 mm and fe = 25.5 mm. a distance of 61.0 mm separates the lenses. the microscope is being used to examine an object places do1 = 24.1 mm in front of the objective. find the final image distance.

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)