Question

& what is the nelation between the focal length
and nadius of clenvature of a sphenical Minnord
(Goncave Mimor or convek minnon)
prakcie
date the focal length of a sphenicol mincon
Teacher's Signature​

Answer 1

Answer:

focal length is a length between focus to the pole

radius of curvature is length between centre of curvature to the Pole

Answer 2

each of two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are all allotropes of carbon.

Please mark this as brainliest answer