Hello world

RESPIRATION is the overall process by which organisms oxidise food to release energy. In most plants, AEROBIC respiration takes place. The respiratory gases are exchanged through the stomata, tiny pores on the lower part of a leaf. The oxygen is then taken to plant cells where glucose is oxidised to produce energy in the mitochondria.

1) Ray passing through lens in a direction parallel to principal axis passes through focus on refraction. 2) Ray passing through principal focus of a lens passes in a direction parallel through principal axis on refraction. 3) Ray passing through the optical center of a lens suffers no deviation even after refraction.