Question

Radius of __________ of a lens is the radius of the glass sphere from which the surface of the lens are cut​

Answer 1

Answer:

answer is curvature. I hope it helps you.

Answer 2

• let pq =oq=x
• here u=-x; v=+n
• so
• u²÷v -u¹÷v=u²-u upon r
• 1.5upno x +1 upon x = 1.5-1 upon r
• 2.5 upon x = 0.5 upon r
• n = 5r
• so op=oq = 5r