It is round or say spherical to widen the range of photography and it is designed to focus the image as the ray are coming from infinity so !!
I am not an expert of camera but ya it is the main theme !!
The power dissipated across a component can be calculated through the formula P=I^2xR
Substituting the values in we get P=(0.5)^2x10=2.5W
Sunshine will help prode vitamin C
I think it's C, three hues that are adjacent on the color wheel
'C' is a simple explanation of astigmatism.
