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Jack slaps Piggy so hard that it breaks one of his glasses lenses. He then goes on to mock his whining voice with his own parody of it to ridicule him. Tsch Tsch Should've Read it. All the same, your welcome.
When Jack accused Piggy of not helping much with the building of the fire in chapter2: Fire on the Mountain Simon defended Piggy by mentioning that they had used Piggy's spectacles to light the fire so he had helped in that way.
In Chapter 10, Piggy suggests that they let the fire go out at night and relight it every morning because he concludes that the smoke will not be visible at night. At this point, Ralph is frustrated that Jack has started his own tribe. Ralph is also discouraged that only he and Piggy seem intent on keeping the fire going. Upon hearing Piggy's suggestion, Ralph agrees to let the fire go out. However, Ralph thinks it would be ideal to have the fire going all the time. The fire also gives Ralph a sense of security, especially at night: Ralph stood up, feeling curiously defenseless with the darkness pressing in.
his glasses
The other two characters who helped keep the fire burning in "Lord of the Flies" were Piggy and Simon. Piggy was responsible for suggesting the idea of using Piggy's glasses to light the fire, while Simon helped to gather wood for the fire.
Ralph wants to get Piggy's specs back and Piggy wanted to kill Jack there and then.
They took Piggy's glasses, and fire from Ralph's camp.
Piggy suggests building the fire on the beach by using the lenses of the boys' glasses to focus the sunlight and start the fire. He recommends using the lenses like a magnifying glass to create the fire. Eventually, they successfully build the fire on the beach.
Ralph interrupts and bitterly accuses them of irresponsibility for letting the fire burn out. The hunters, still in the grip of the thrill of the hunt, ignore him. Ralph once again tries to make them realize the enormity of their blunder. In quick and angry retaliation, Jack strikes out at Piggy, forcefully slapping his face and breaking one lens of his glasses
they use his "specs" to focus the sunlight to set the wood on fire.
It is Jack's idea to use Piggy's glasses to start the fire. Jack steals the glasses right off of Piggy's face without even asking him first.
The boys use his specs(glasses) to direct the sunlight to the sticks on the mountain and make a fire.