Question

If a biconvex lens is cut along the plane of principal axis, what will be the new power of the lens. Assume original power to be P..

Answer 1

it remains same
u got some formula right
p = (u-1)(1/r1 - 1/r2) since r1 and r2 dont change it remains same.......
if cut vertically um well use the same eqn nd solve it

Answer 2

Principal plane is perpendicular to optical axis.
The power will be halved.

Answer 3

See: http://en.wikipedia.org/wiki/Principal_plane#Principal_planes_and_points
ans scroll down to 'Principle planes and points'

Answer 4

i agree power wil be halved. . .

Answer 5

it'll be P/2