Flat nose pliers are used for gripping and bending wire. Tronex flat nose pliers feature very fine tips, smooth jaws and slightly rounded inner edges. Some of these pliers feature a step in the tips for additional leverage. If you don't require the longer tips as in these pliers, I would recommend looking at the P544/P744 or the P545/P745 as they have a shorter tip which will be stronger and give you better control over your work.

Marginal raysformula

You can set the number of rays 3 in 3D viewer and desired field point. Out of 3 middle ray will be your chief ray and two other going from the periphery of stop surface is your marginal rays.

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Chandan is correct in that you can pick out the marginal and chief rays from the 3D viewer, but there is no way that I know of to plot only those.