(1) A dark green, round biconvex tablet with opaque coating.

(2) Of biconcave of computer clavier biconvex sheltered evil people and practices the most easily, cleanness rises special inconvenience.

(3) The optical aberration difference between the biconvex Fresenl lens and the plane-convex Fresenl lens was investigated by designing a large aperture Fresenl lens.

(4) A transparent, biconvex body of the eye between the iris and the vitreous humor that focuses light rays entering through the pupil to form an image on the retina.

(5) Background: The crystalline lens of the human eye is a biconvex elastic body behind the pupil.

(6) The second lens group (G2) is provided with at least one biconvex lens group (L21).

(7) The rule of adaxial image formation is studied, of the transmission light and reflected light through the two optical surfaces L_1 and L_2 of the biconvex lens.

(8) This paper, in detail, introduced how to study the rule of image construction for biconvex lens by using the method of vision difference.