An emmetrope with +60 D unaccommodated power focuses on an object at a near pointof 25 cm from the eye. How much accommodation is required?

A simple refracting telescope with an objective lens with focal length 2.00m and and eye piece of with focal length of 2.0 cm is used to view Mars when it is 6 x 107km from the Earth. For the purposes of this question assume the unaided human eye can resolve objects 0.002 radians apart, what feature size can be seen on Mars with telescope? For the purpose of his problem assume that the diameter of the telescope is sufficiently large that diffraction does not play a role. o 2400 km o 1200 km o 3600 km o 120 km

What is the near point in cm of a person whose eyes have an accommodated power of 54.3 D? (Assume a lens-to-retina distance of 2.00 cm.) cm

An object and an image screen are separated by 50 cm. There are two locations betweenthem where a thin lens with f = 8 cm can be placed so that a focused image forms on thescreen. Find the two positions.