Please help? =(

Using a refracting telescope, you observe the planet Mars when it is 2.13 X 1011 m from Earth. The diameter of the telescope's objective lens is 0.991 m. What is the minimum feature size, in kilometers, on the surface of Mars that your telescope can resolve for you? Use 545 11111 for the wavelength of light. You stand on a straight desert road at night and observe a vehicle approaching. This vehicle is equipped with two small headlights that are 0.651 m apart. At what distance, in kilometers, are you marginally able to discern that there are two headlights rather than a single light source? Take the wavelength of the light to be 557 nm and your pupil diameter to be 5.47 mm. The 305 m diameter Arecibo radio telescope detects radio waves with wavelengths from 3 to 100 cm. What is the angle in radians between two just-resolvable 5.00 cm wavelength point sources for this telescope? angle: 0.02 rad How close together could these point sources be at the 2.64 million light year distance of the Triangular galaxy (M33)? distance: Ly TOOLS Question ( X10' sics