Shadow is an optical phenomenon.

The darker areas formed by objects that block the propagation of light and cannot pass through opaque objects are called shadows.

The shadow is divided into umbra and penumbra, which is not an entity, but just a projection.

Shadows arise due to the principle that objects block out light.

Light rays travel in a straight line in the same homogeneous medium, and cannot pass through the darker areas formed by opaque objects, and the resulting projection is what we often call shadows, and of course light must also be visible light.

There are two conditions for the creation of shadows, namely light and opaque objects.

In the shadow of strong light, the shadow will appear very dark in the middle and slightly lighter around the shadow.

The particularly dark part of the shadow is called the umbra, and the dark part around it is called the penumbra, and these phenomena are closely related to the straight propagation of light.

If you put a cylinder on the table and light a candle next to it, the cylinder will cast a clear shadow.

If two candles are lit next to the cylinder, two shadows are formed that do not overlap each other.

The part where the two shadows overlap is completely black, and the place where there is only one candle next to the umbra is the half-light and half-dark penumbra.

If you light three or even four candles, the umbra will gradually shrink, and the penumbra will appear in many layers, and the object can form a shadow composed of umbra and penumbra in strong light, which is also the reason.

Obviously, the larger the area of the luminous object, the smaller the umbra.

If we light a circle of candles around the cylinder, the umbra will disappear completely, and the penumbra will be invisible.

"Why, you sectarians have been trying their best to find me, and now I took the initiative to show up in order to prevent you from racking your brains and trying to break your head, but you don't want to see me?" said the shadow.

"It turns out that you bastard has always been playing tricks, and now that you are willing to show up, I guess you see a chance to win, right? Or do you want to delay time and let Yun Zhongzi and them all die?" Zhao Gongming said angrily.

"I'm just fulfilling your wish, and letting the three thousand immortals die, so that you can intercept the sect and come forward to clean up the mess, isn't it a good thing?"

"Hell knows what you're up to, if you're a good person, you won't hide your head or tail!"

"Zhao Gongming, you are judging people by shadows, such a one-sided reason, who can be convinced in the Three Realms? Isn't my arrival just to make up your mind for you? As you wish, I just want to help you simply, don't refuse without appreciation, otherwise people will be sad, hahahaha......"

Zhao Gongming's eyes glowed with a strange light, and he said angrily: "If I guessed correctly, you are the Black Heaven Demon Emperor, right?

"Black Heaven Demon Emperor, are you mistaken, I am Rahu's Shadow Protector Shadow Blade? Why, Xi has never heard of Uncle Ben, and he seems to be lonely and unheard?" Shadow said displeased.

Zhao Gongming said angrily: "Don't deceive people, a lone remnant, do you really think you can enter Biyou Palace?"

"People all these years are sick, and they don't believe even the truth, and it seems that they are not lightly ill. ”

As he spoke, the shadow gradually transformed into a man in a black robe, and as soon as he grasped it in his hand, a spear appeared in his hand.

"If you accidentally die, remember to tell the king of Hades the name of this uncle. ”

The Shadow Blade's eyes revealed a fierce light, and the sharp spear stabbed at the back of Zhao Gongming's head.

At the time of life and death, Zhao Gongming's mind moved, and the twist turned into a breeze, and finally the danger was born.

"Shadow Blade, you dare to sneak into Zizhi Cliff, I will make you regret coming to this world!"

With a wave of his hand, Duobao Dao sacrificed the string of Dinghai God Beads, which emitted colorful light, and suddenly wanted to stun the five senses of the shadow blade, whose power was comparable to the power of the four seas, and he didn't believe that this demon could be prevented.

Shadow Blade snorted softly, his eyes narrowed, and suddenly shot out two rays of light intertwined with Xuan Ming Qi, beating the colorful divine light of Dinghai Zhu to tremble.

"It's so powerful, even Dinghaizhu can't help it, it's not a thing of the Three Realms. Zhao Gongming muttered in shock.

He knew the power of the Dinghai Divine Bead, except for magic weapons like Dona Gourd that could lower it, within the Three Realms, there were very few people who could compete with its colorful gods.

"What the hell are you, that you are not afraid of my magic weapon?"

Zhao Gongming decisively accepted the Dinghai Divine Pearl, took out the golden whip and dragon rope, and asked loudly.

"After all, the magic weapon is only something outside the body, and once it is restrained, it will cause devastating disasters. Although I am only in the Da Luo Jin Immortal Realm, I am more than twice as strong as the Da Luo Jin Immortal who relies on external objects like you, you should be glad that I didn't kill you, otherwise you wouldn't be safe and sound. ”

"Do you think I'm going to believe your nonsense?"

"You can not believe it, but if you try again, you will definitely suffer the sin of backlash, and you will harm others and yourself, so you can't blame me for not warning you!" Shadow Blade admonished bitterly.

Shendi, Yu Lei, Bai Jian, Zhu Rong, Zhu Bi, Ju Mang, Gonggong, Xuan Ming, Lizhu, Li Mu, Houtu, Bei Harvest, Zhuhai, Candle Yin, Bi Fang, Tianwu, Kuafu, Lu Wu, Yingzhao, God Emperor, Chi Songzi, and Feng Huang didn't care about the opinions of Our Lady of Jin Ling and Sanxiao Niangniang, and the twenty-two immortals formed a team of their own opinions, and then turned into golden light and swept down the Zizhi Cliff.

They don't exist to protect the sect, as immortals, it is their duty to punish demons and eliminate demons, so as soon as the three thousand demon gods come to Penglai Immortal Island to fight, they will force the twenty-two immortals to have to fight, even if it is against the wishes of the Duobao Dao people, they will not hesitate.

As soon as the twenty-two immortals arrived, the three thousand immortals such as Yun Zhongzi and Huanglong Zhenren breathed a sigh of relief, the sect was too selfish, they didn't save when they saw death, and they didn't kill demons, which really disappointed them.

"Brother Zhang, it's not good! Twenty-two immortals, including Shen Di, Yu Lei, Bai Jian, Zhu Rong, and Zhibi, did not listen to the greeting, and went down the cliff to fight the demons privately. Luo Xuan entered the main hall and reported to the Duobao Dao people.

"What, the twenty-two immortals, Jumang, Gonggong, Xuanming, Lizhu, Limu, Houtu, Beishui, Zhuhai, Candleyin, Bi Fang and others can't hold back the Zizhi Cliff?" asked Duobao Daoren's face was shocked.

"Not only them, but even Tianwu, Kuafu, Lu Wu, Yingzhao, God Emperor, Chi Songzi, and Feng Huang no longer listened to repeated orders, and even went down directly from the cliff pass without even passing the waist pass and the cliff pass. ”

After hearing this, Duobao Daoren's face was extremely ugly, and he slapped the case with a "bang": "Bastard, I still expect them to intercept the Dharma for the sake of the face of the senior brother of Gongming, but now they don't listen to the assignment or say anything, and they leave without even saying hello, and they are in a hurry to send them to death?"

The eyes of the Duobao Dao people, who were a little swollen and painful in their palms, were burning with anger, as if they were about to burn.

"Senior Brother Zhang, Chi Songzi and the Divine Emperor accuse you of being selfish at all, not removing the Demon Guardian Dao, and only focusing on the false name of intercepting the sect, and saying that you have no moral cultivation. Luo Xuan lowered his head and said cowardly.

After hearing this, the two rows of steel teeth clucked, and they were extremely angry.

"Senior brother, they don't belong to the people who intercept the sect, and now they can help us contain some demon masters, and it can be regarded as the efforts of Senior Brother Gongming that have not been in vain, and I hope to be patient for the time being for the sake of intercepting the overall situation of the sect. Luo Xuan persuaded with good words.

"Alas, for the sake of the overall situation, I can only swallow my anger. If I had known this, I wouldn't have let Senior Brother Gongming bring fifty teams of immortals to the rescue. Now it's self-defeating, but it's not beautiful!" said Duobao Daoren in a deep voice.

At this time, Lu Yue flashed in again: "Senior brother, things are not good, a demon master has sneaked into Zizhi Cliff, Senior Brother Gongming is fighting with him very hard, it seems that even the Dinghai Divine Bead can't work!"

"Alas, I know that Rahu is not a fuel-efficient lamp, in the Northern Ming family, such an encounter is heartbreaking, and now I still remember it vividly, this big trouble is still coming after all. ”

"Remember, the demons have the means to change the simulation, even I may not be able to see through it, immediately spread it down, intercept all the sects under martial law, each lead the post, and don't walk around, lest the demons take advantage of this loophole!"

"Yes, Senior Brother!" Luo Xuan and Lu Yue said in unison in a serious and serious manner.