Optics.

go beyond the Bottom of the Bye, beforethey come to a hocus, or form the Image;a convex Glass will make the Bays fall 1 ^® reconverging to the Pupil, and on the umours, by which means the focal Di ancewill be shorten’d, and adjusted to the Retina \

where distinct, Vision of Objects will then

effected.

By convex Spectacles Objects appear morbright , because they collect a greater Octantity of Rays on the Pupil. And they ap-pear at a greater Distance than they are ; forthe nearer the Rays approach to parallel ones,the more distant the Point will be to whichfbey tend. , , .r tV> „

1 have already observed, that if tObject be placed nigher to the convex Glassthan its Focus, it will appear erect and mag-nified ; which makes them of such generaUse as Reading-Glajses. ^

If an Object be placed in the Focus oa convex Lens, the Rays which proceefrom it, after they have pass’d through tGlass, will proceed parallel; and there orean Rye placed any where in the Axis wibav e the most distinct View of the Objectpossible; and if it be a Lens of a st* 13 -focal Distance, then will the Object appear♦IS much larger as it is nearer, than when° you