6.a ray of lights is travelling in grass reaches a boundary with air and split into two arrays as shown

a. it has been partially internally reflected

b. it has been partially internally refracted.

c. it has been totally internally reflected.

d. it has been totally internally refracted.

the answer would be A

Explanation:

because half is reflected

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

i need an image of the diagram