Question

1. Ozane is a poisonaus gaus with smelle,
2. the distana beluseen the optie centre of a lens
and its pezinipal fons is called​

Answer 1

Answer:

1,ozone is not an harmful gas 2 The focal length of an optical system is a distance measure between principal focus and optical centre, it also defines the lens's angular field of view. For a given lens, the shorter the focal length, the wider the angular field of the lens.