My very first thoughts are that you would try and do an activity that involves the binoculars. I understand the book idea, about equality and how we are all different but should be treated them same. This could also be done along side too.
Why should the other children tell her she can't use them. If you create a game that involves all the children, like a treasure hunt or 'Spot The Object', so they take it in turns to find an object that you have a picture of.
Get them in pairs maybe, one has the picture of an object, the other has to look for it, standing in one spot so they are not all wondering around the place bumping into things.
Swap pairs etc, if a child does not want to work with 'Tian' or says she can't do it, then explain everyone has a go, the binoculars are for everyone to use, we are all the same and everyone is allowed to use them. We don't want to upset our friends etc etc.
I would also put into your scenario write up, that they setting should make sure they have materials that promote equality and diversity like puzzles and books that depict different races and disabilities etc. Just to show you have thought about it in a wider context.
Maybe, just my thoughts, probably a load of twoddle
