A5 kg picture is framed and hung on a wall by two strings at 45 degrees. What is the tension in each string?

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.

Diverging mirrors and lenses always produce images