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a. iron cannot be oxidised further b.5.08 c.pipette (using a pipette filler for safety reasons) d.green (because thE COLOUR OF IRON (ii) Ions is green ii. pink because as long as iron (ii) ions are being used up pink is maintained

Yes, I'm quite sure that the answer is because it is easier to view from the back of the screen as there is no obstruction of light rays.

I beleive that it is to minimize the scattering of light rays to form a clearer image and also beause it will be easier to view the mage grom the back of the screen as well

what is the lens? Concave or convex?