Time passed quickly, and in the blink of an eye, Wang Du had been in retreat for a full seven days.

During these seven days, he sat motionless and meditated, and in his spiritual world, Wang Du was carrying out complex deductions.

In Wang Du's previous life, the sun was the strongest energy body in the world that could be contacted, and the energy generated by sunlight shining on the earth every day alone was an astronomical amount, and the means of human beings using solar energy were still very limited.

Now that Wang Du has crossed over, he has arrived in the Tianqian Continent, this world does not have the scientific theory of the previous life, it is a special world of cultivating immortals. It's just that there is also a sun and a moon in this world, and the immortal art that Wang Du is conceiving at the moment has a close relationship with the sun.

In Wang Du's vision, he intended to gather the energy of the sun to attack his enemies, so that he could use very little of his own energy to unleash powerful attacks.

And the most direct attack method that Wang Du thought of was the irradiation of the sun's rays.

But the scattered sunlight is definitely not lethal, so Wang Du wants to sit down to concentrate the sun's rays.

The best way to gather sunlight is the reflection of the mirror, and by adjusting the angle of the mirror, the sunlight is concentrated at one point, so as to achieve the role of the enemy.

But when facing the enemy, let's not talk about whether you carry so many mirrors with you, even if there are so many mirrors, the enemy will not be able to give you time to set up.

So Wang Du thought of using a formation to solve this problem. After all, this is the world of cultivating immortals, although there is no scientific theory as the cornerstone, but many things cannot be explained by scientific theories.

How powerful will it be to form a huge convex lens with a formation, and then arrange it at a special angle to aggregate countless rays to one point?

In Wang Du's preliminary design, he planned to use 100,000 small convex lenses to gather light, and then arrange and combine the angles of these 100,000 small convex lenses, so that the light gathered by 100,000 convex lenses converged into a point again, and finally achieved the purpose of injuring the enemy.

Although this is only Wang Du's theory, he feels that the feasibility is very high, so he will study the formation in order to further increase his attack strength through the formation.

After his own careful deduction, Wang Du finally came to the final result, and after getting the result, Wang Du was not blindly happy, but began to work on the production of convex lenses as soon as possible.

As a doctor of physics, Wang Du naturally knew how to make glass from sand, so he immediately found a large amount of sand and began to refine glass.

Soon the first batch of glass was refined and polished by Wang Du, and this batch of Wang Du obtained about a thousand convex lenses.

With this thousand pieces of convex lenses, Wang Du began to deduce the results and arrange them together.

After the combination was completed, Wang Du moved it to the garden for experiments.

"Childe, you've been working on this thing every day for the past month, what's the use of it?"

Chen Bo was very curious when he looked at what Wang Du had made, and Wang Du didn't explain it to Uncle Chen, because he must have explained to Uncle Chen that he didn't understand, so it was more useful to experiment with Uncle Chen than to explain.

Move the position of the convex lens array so that sunlight shines directly on it, and sure enough, a dazzling light is gathered on the ground.

I found a piece of wood and put it in the spotlight, and in an instant the wood burned through a hole.

Wang Du is still very satisfied with this result, although this power is far from enough, but at least it proves that the theory is still feasible.

"Hey, this thing doesn't have any aura fluctuations, it can actually emit energy, it's really weird. ”

Uncle Chen was interested, he had never seen anything like this, so he was inevitably a little curious.

"Uncle Chen, this thing is called a convex lens, it can gather sunlight, and then produce powerful energy, just like what you saw just now, the original warm and comfortable sunlight has a certain degree of lethality after passing through it. ”

Wang Du gave Uncle Chen a brief explanation, and then Uncle Chen nodded as if he didn't understand, and then Wang Du saw Uncle Chen's hand wave in the air, and a circle of light with a special texture appeared in mid-air.

"Whew!"

As soon as the aperture appeared, a beam of light shot out of the aperture, and then a large crater appeared in the ground.

“............”

Wang Du was a little speechless, he even bothered to refine the glass, and then polish it into a convex lens, but this Chen Bo actually made an aperture that could gather light with a casual wave of his hand.

"Childe, is that the case? This kind of concentrating array can also have the same effect, why does Childe bother to tinker with these things?"

Chen Bo looked at Wang Du with a puzzled expression, he felt that Wang Du was so strange, why did a really simple thing have to be so complicated.

Wang Du smiled embarrassedly, this one he felt that he really took off his pants and farted too much, he had already crossed over, but he still liked to use the way of thinking in his previous life to solve the problem.

"That, this, Uncle Chen, can you teach me this is a concentrating array?"

Wang Du asked Uncle Chen with some embarrassment, if he learned this concentrating array, then he would not have to tinker with the convex lens to solve the problem of concentrating sunlight. 12

"Of course, it's not a big deal, you take this book, and you should know how to set up a spotlight array when you look at it. ”

Chen Bo casually took out a book and threw it to Wang Du, and then he began to take care of the flowers and plants outside the cave.

Wang Du took the book, saluted Uncle Chen, and then returned to his cave mansion.

As soon as he returned to Dongfu, Wang Du began to study the arrangement method of concentrating light.

In fact, the layout method of the concentrating array is very simple, and Wang Du only needs to master a few simple talismans to depict the concentrating array.

With Wang Duxue's hegemonic learning ability, isn't it as easy as drinking water to learn a few simple talismans?

Soon, Wang Du successfully drew his first spotlight array!

Sure enough, Wang Du's learning ability is very fast, and his first concentrating array was a one-time success, although it is still a little unstable, but it can indeed condense light.

"Great, with this means, I just need to arrange these concentrators. ”

Wang Du was very happy, what was originally going to be fiddled with with 100,000 convex lenses was now solved with only a few simple concentrating arrays, and it was even more powerful, how could Wang Du not be happy?

After another three days of retreat, Wang Du finally mastered the Gathering Array, and now he could depict and tie three Gathering Arrays in between breaths.

"Almost, let's try it first. ”

Wang Du got up and walked to the practice field that each cave house has built, and then he put the test dummy on the practice field.

Taking a deep breath, Wang Du was engrossed, and he concentrated all his spirit.

Raising his hand, his fingers quickly sketched in the air, and soon three concentrating arrays appeared in front of Wang Du. The three concentrating arrays overlapped, and then Wang Du hit a golden light on the test dummy.

The test dummy that Wang Du is using now is an intermediate test dummy, and it can withstand the full force and force of the Eight Rank Early Tongtian Ancestor, so after Wang Du's golden light hits it, it only causes slight damage.

With a general understanding of the lethality of normal golden light, Wang Duyou hit a golden light on top of the three superimposed light arrays!

"Hugh!"

The golden light passed through three layers of concentrating light and then fell on the test dummy.

The result of the test made Wang Du stunned, and one of the arms of the test dummy was directly shattered by the golden light that passed through the three-layer concentrating array!

You must know that this is a test dummy that can withstand the full force of the Eight Rank Early Tongtian Ancestor's attack! What realm is Wang Du in now? His attack can actually destroy one of the arms of this test dummy with amazing defensive power.

"It's done!"

Wang Du was overjoyed, he was able to do ten times the work with just a slight change. And this is still not a perfect move, once Wang Du has perfected this move, then how terrifying will it be? I am afraid that only those who have experienced it are qualified to comment.

At the same time, Wang Du's butler Chen Bo suddenly stagnated, and then an incredible look appeared on his face.

"From ancient times to the present, no one has thought of using the concentrating array like this, and this kid has really brought a lot of shock to the old man. ”

After Uncle Chen muttered to himself, he began to take care of the flowers and plants in front of him again.

The prototype of the killing move is already there, Wang Du only needs to spend time constantly perfecting it, and I am afraid that there are many problems that need to be solved when he can use it to fight the enemy.

For example, the hit rate, the enemy is alive, he may not move and let Wang Du attack him, although the speed of light is very fast, but Wang Du can shoot at Wang Du between the breaths of the concentrating array.

For example, can you attach some special attributes to it, such as the power of the blood point bloodline of the Pan King, or the power of the rune of the one-yuan true solution.

If these supreme powers could be attached to this killing move, wouldn't its power be even more terrifying?

However, Wang Du can't solve these things for a while, he can only solve them slowly, after all, this kind of thing is not in a hurry, the more you are in a hurry, the more you can't think of a way, on the contrary, if you are not in a hurry, the solution may appear in your mind.

Wang Du cleaned up, he was going to listen to the first class of the first class, counting that he had been in Tianqian Academy for more than two months, he had not even listened to a class, if it was in the university in his previous life, he would have been persuaded to quit by the school.

However, before going to the class, Wang Du still had some things to do, so he returned to the cave and picked up a pen and quickly traced something on the paper.

After about an hour, Wang Du stopped writing, and then he checked it several times before nodding with satisfaction.

This thing is a gadget he invented on a whim, and Wang Du painted it down to send it to the hands of Gong Lian, so that Gong Lian can try to make one and test its power.