(a) What power contact lens is needed to correct the vision of a person who has a near point of 76.0 cm and allow him to see objects 25.0 cm away? (b) If this person has a normal 8.00% ability to accommodate (increase) the power of his eyes, what is the maximum distance objects he can see clearly with his contact lenses and with totally relaxed eyes? (Assume a lens-to-retina distance of 2.00 cm. If he can see very distant objects clearly, enter 'infinity'.) m

let aperture stop == radius of lens == object height

A near-sighted man can only focus on distances of dfar = 5.66 m or closer. What power lenses does he need in his glasses for distance vision? Your answer should be in diopters (m-1).

What is the far point in m of a person whose eyes have a relaxed power of 52.5 D? (Assume a lens-to-retina distance of 2.00 cm.) m

What is the power of the eye in D when viewing an object 29.6 cm away? (Assume the lens-to-retina distance is 2.00 cm.)

You overindulged on a delicious dessert, so you plan to work off the extra calories at the gym. To accomplish this, you decide to do a series of arm raises holding a 5.5 kg weight in one hand. The distance from your elbow to the weight is 38 cm, and in each arm raise you start with your arm horizontal and pivot it until it is vertical. Assume that the weight of your arm is small enough compared with the weight you are lifting that you can ignore it. As is typical, your muscles are 20 % in converting the food energy they use up into mechanical energy, with the rest going into heat. If your dessert contained 350 food calories, how many arm raises must you do to work off these calories?