Question

a convex lens of short focal length bends the light rays through large angles by focusing them closer to the optical Centre similarly concave lens of very short focal length causes higher divergence than one with longer focal length explain the sentence

Answer 1

If 1/9=0.1111……..

2/9=0.222…….. Then find

a)0.111…….+0.444……=.........

b) √0.444….=......