Correct.

"And if anyone's name was not found written in the book of life, he was thrown into the lake of fire."  Revelation 20:15 (NAS)

Who else (and what else) was thrown into the lake of fire?

"the beast and those who worshiped his image; these two were thrown alive into the lake of fire..."  Revelation 19:20  (NAS)

"And the devil who deceived them was thrown into the lake of fire and brimstone, where the beast and the false prophet are also..."  Revelation 20:10 (NAS)

"And death and Hades were thrown into the lake of fire..."  Revelation 20:14  (NAS)

What is the lake of fire like and how long will it last?

"...lake of fire which burns with brimstone."  Revelation 19:20  (NAS)

"...thrown into the lake of fire and brimstone...and they will be tormented day and night forever and ever."  Revelation 20:10  (NAS)

"...this is the second death, the lake of fire."  Revelation 20:14 (NAS)

Other references in Scripture to this unquenchable eternal fire (also called "hell"):

"And His (Jesus') winnowing fork is in His hand, and He will thoroughly clear His threshing floor; and He will gather His wheat into the barn, but He will burn up the chaff with unquenchable fire."  Matthew 3:12 (NAS)

"Every tree that does not bear good fruit is cut down and thrown into the fire.  Matthew 7:19 (NAS)

"Therefore just as the tares are gathered up and burned with fire, so shall it be at the end of the age.  The Son of Man will send forth His angels, and they will gather out of His kingdom all stumbling blocks, and those who commit lawlessness, and will cast them into the furnace of fire; in that place there shall be weeping and gnashing of teeth.  Then the righteous will shine forth as the sun in the kingdom of their Father. He who has ears, let him hear."  Matthew 13:40-43 (NAS)

"So it will be at the end of the age; the angels shall come forth, and take out the wicked from among the righteous, and will cast them into the furnace of fire; there shall be weeping and gnashing of teeth."  Matthew 13:49-50  (NAS)

"And if your hand or your foot causes you to stumble, cut it off and throw it from you; it is better for you to enter life crippled or lame, than having two hands or two feet, to be cast into the eternal fire."  Matthew 18:8 and Mark 9:43 (NAS)

"Then He will also say to those on His left, 'Depart from Me, accursed ones, into the eternal fire which has been prepared for the devil and his angels; for I was hungry, and you gave Me nothing to eat; I was thirsty, and you gave Me nothing to drink; I was a stranger, and you did not invite Me in; naked, and you did not clothe Me; sick, and in prison, and you did not visit Me.'  Then they themselves also will answer, saying, 'Lord, when did we see You hungry, or thirsty, or a stranger, or naked, or sick, or in prison, and did not take care of You?'  Then He will answer them, saying, 'Truly I say to you, to the extent that you did not do it to one of the least of these, you did not do it to Me.'  And these will go away into eternal punishment, but the righteous into eternal life."  Matthew 25:41-46  (NAS)

"And if your hand causes you to stumble, cut it off; it is better for you to enter life crippled, than having your two hands, to go into hell, into the unquenchable fire, where their worm does not die, and the fire is not quenched.  And if your foot causes you to stumble, cut it off; it is better for you to enter life lame, than having your two feet, to be cast into hell, where their worm does not die, and the fire is not quenched.  And if your eye causes you to stumble, cast it out; it is better for you to enter the kingdom of God with one eye, than having two eyes, to be cast into hell, where their worm does not die, and the fire is not quenched."  Mark 9:43-48  (NAS)

"And also the axe is already laid at the root of the trees; every tree therefore that does not bear good fruit is cut down and thrown into the fire."  Luke 3:9 (NAS)

"And His (Jesus') winnowing fork is in His hand to thoroughly clear His threshing floor, and to gather the wheat into His barn; but He will burn up the chaff with unquenchable fire."  Luke 3:17 (NAS)

"If anyone does not abide in Me (in Jesus), he is thrown away as a branch, and dries up; and they gather them, and cast them into the fire, and they are burned.  John 15:6  (NAS)

"...and to give relief to you who are afflicted and to us as well when the Lord Jesus shall be revealed from heaven with His mighty angels in flaming fire, dealing out retribution to those who do not know God and to those who do not obey the gospel of our Lord Jesus.  And these will pay the penalty of eternal destruction, away from the presence of the Lord and from the glory of His power..."  II Thessalonians 1:7-9 (NAS)

"For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a certain terrifying expectation of judgment, and the fury of a fire which will consume the adversaries."  Hebrews 10:26-27  (NAS)

"But the present heavens and earth by His word are being reserved for fire, kept for the day of judgment and destruction of ungodly men."  2 Peter 3:7  (NAS)

"And another angel, a third one, followed them, saying with a loud voice, "If anyone worships the beast and his image, and receives a mark on his forehead or upon his hand, he also will drink of the wine of the wrath of God, which is mixed in full strength in the cup of His anger; and he will be tormented with fire and brimstone in the presence of the holy angels and in the presence of the Lamb.  And the smoke of their torment goes up forever and ever; and they have no rest day and night, those who worship the beast and his image, and whoever receives the mark of his name."  Revelation 14:9-11  (NAS)

Who were spared from this second death, the lake of fire?

"This is the second death, the lake of fire."  Revelation 20:14

"He who has an ear, let him hear what the Spirit says to the churches. He who overcomes shall not be hurt by the second death."  Revelation 2:11  (NAS)

We beg you again to make sure that you have obeyed the gospel of Christ and that you will commit to being faithful until death (see Lesson 1).