dirgh sandhi aur vridhi sandhi mein antar bataiye ?

DIRGH SANDHI::Saman svaro ke beech hone vali sandhi dirgh sandhi kehlati hai.jaise vedant=ved+ant(a+a=aa)

VRIDHI SANDHI::Jab a/aa ke baad ae/aee ho toh ae, aur o/oo ho, toh oo ho jata hai jaise hit+ashi=hiteshi(a+ae=aee)