What are the Limits of the line of sight requirement in spells?

Question

As wizard, would it be possible to use your familiar's line of sight as your own for spells such as Mirage Arcane which has a range of sight? Would You be able to use a telescope or spyglass to use that spell?

Also a bit related: "Is it legal to cast a spell with a range of Sight on someone you can see, but without a clear path?" — Exempt-Medic, Mar 17 '20 at 02:27

score 1 · Accepted Answer · answered Mar 17 '20 at 01:43

A familiar’s line of sight counts as your own when you are seeing from its eyes, and this works for spells that require line of sight, so yes for a familiar.

Their is no telescopes in RAW, so I’ll talk about spyglass. A spyglass does not increase how far you can see by the book, instead it “magnifies objects to twice their size, like a magnifying glass. So for this portion, I’d have to say no, not by RAW.

What are the Limits of the line of sight requirement in spells?

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