If the Person being led in Prayer cannot see the Imam nor anyone who is behind the Imam, but he can hear (the Imam's Voice)

Question :

What is the ruling of the prayer that is offered in the basement of the Masjid if the person who is being led in prayer cannot see the Imam nor any of those who are praying behind the Imam, but the person only hears the voice of the Imam by way of a microphone?

Answer:

There is no problem with that if the basement (or cellar) is connected to the Masjid, due to the generality of the evidences.

Question :

A group of people offered the Jumu'ah (Friday) prayer in the basement of the Masjid (on the ground floor, i.e., the Musalla was upstairs) and during the prayer the electrical current was cut off. Then, those who were being led were unable to hear the Imam, so one of those being led stepped forward and led them in the rest of the prayer. What is the ruling of these people's prayer, since he led them in the rest of the prayer performing it as the Jumu'ah prayer? Also, what is the ruling if no one steps forward? Does each of them complete his prayer by himself? If that is permissible, then does he complete the rest of the prayer as Zuhr prayer or Jumu'ah prayer, since he listened to the speaker (Khatib), started the prayer with the Imam and prayed one Rak'ah with him?

Answer:

If what the questioner mentioned has occurred, then the prayer of all of those people is correct, because whoever caught a Rak'ah of the Jumu'ah prayer, then he caught the Jumu'ah prayer, as is reported in an authentic Hadith from the Messenger of Allâh. If no one had stepped forward and each of them prayed the last Rak'ah by himself, then that would have been sufficient for him. This is like the person who misses a Rak'ah and he prays whatever he catches with the Imam, then he makes up the second Rak'ah for himself. This is according to the generality of the Prophet's statement:
"Whoever caught a Rak'ah of the prayer, then verily he caught the prayer. "

And Allâh is the Giver of success.

Question :

If a man enters the Masjid during a time when it is prohibited to pray, should he offer Tahiyyatul-Masjid (prayer for greeting the Masjid) or not?

Answer:

It is better for the person to offer Tahiyyatul-Masjid according to the more correct of the two opinions of the scholars. This is due to the generality of the Prophet's statement:
"When one of you enters the Masjid, he should not sit until he prays two Rak'ahs."

This Hadith's authenticity is agreed upon (in Al-Bukhari and Muslim). However, if he sits and does not offer the prayer, there is no harm in that.

Source:
Ash-Shaykh Ibn Baz
Fatawa Islamiyah, Vol. 3 Pages 24-25