My questions is regarding Idghaam with Ghunnah for the letters (yaa) and (wow).

Question
Assalamualaykum wa rahmatullahe wa barkatuhu

My questions is regarding Idghaam with Ghunnah for the letters (yaa) and (wow). It is known that the Idghaam for these 2 letters will be incomplete hence there will be some of the (noon) sound still remaining. I was reading to a Shaykh and when correcting my reading he told me that the sound when Idghaam is caused by (yaa)or (wow) should be forced through the mouth and not through the nose. He made me close my nose and read and when the sound of the ghunnah was coming through the nose he told me this is incorrect. So, when making Idghaam due to (yaa) or (wow) is the sound emitted through the nose or from the mouth. I hope you have understood the question and shed some light on this issue.

JazakAllahuKhairan
Wasalam

Answer
Wa alaikum assalaam wa rahmatullahiw a barakatuh,
The idhgaam of the saakinah into the  and is an incomplete idghaam and the characteristic of the ghunnah ()  remains from the . The ghunnah (  ) is defined as a nasal sound that is emitted from the nose, so there must be a nasal sound which accompanies the incomplete merging of the saakinah into the and
The correct proportion of the letter versus the ghunnah is 50% during the idghaam.  50% of the sound should be from the letter or and 50% should be the sound of the ghunnah.