After a check up, a person now has a far point of 100 cm, but with good near point vision. he needs to wear a new pair of corrective glasses. he accidentally takes his old contact lenses with him while traveling. if the lenses of the old pair have a power of -0.5 diopters, what is his far point (measured from his eye) when he is wearing the old lenses?

so his far point according to this pair of glass is 200 cm

Explanation:

power of old pair of corrective glasses is given as

now we have

now we know that for normal vision the maximum distance of vision is for infinite distance

so by lens formula we have

so his far point according to this pair of glass is 200 cm

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

what is the actual question though?