Is Fresnel lens with grooves/Newton rings only present in Toshiba TV or any other one?

More Abdul Majeed Khan's questions See All

What is fitofthora instance of potatoes?

Now research fellow used it to prevent fungus in potato,may be potatoes gene effect.

02 August 2024 180 3 View

What is gangrine? Is there gangrine happened indie potato?

Please discuss someone told about fungus and allied others.

31 July 2024 3,372 3 View

How gold procurement?

Please note it

29 July 2024 4,920 3 View

How gold procurement?

https://www.cleanteqwater.com/resources/case-studies/gold-mine-australia/

29 July 2024 5,161 1 View

Why not cow dung manure used in lie for artificial ?

Cow dung manure is more powerful than artificial fertilizer.

19 July 2024 7,392 7 View

Why not we are following sars COVID 19 guidance?

If the case of Irak is of December 2020 then i think I can suggest pl follow all the infection cause and death, already in our researchgate.

19 July 2024 3,356 2 View

Is cow dung can be in used for repeated use ?

Is this organic cow dung manure now important than artificial fertilizer.if good then why ?

19 July 2024 9,052 2 View

Is there any new COVID infected?

I have come to know one actor told publicly and media that was unable to attend marriage ceremony due to i was admitted in hospital of Mumbai.now negative so I am appeared again in front of...

17 July 2024 2,964 2 View

Do you know why MBBS students in first dissect frogs?

A group of students prefer frogs for dissection.

16 July 2024 4,848 1 View

Why mice taken for experiment s? Why not toad?

If taken mice what benefits like humans will be available and human efficacy and mice?

16 July 2024 2,557 2 View

1. If I can quantize the atom using this hyperbolic spiral and classical physics, could nature do the same?

If we map as a continuous motion an ionising electron (beginning its journey at n=1) in an H atom, a specific hyperbolic spiral appears (see animation). When we solve this spiral formula, we find...

07 August 2024 5,343 2 View

How are iso-frequency contours plotted?

Let's say we have a standard, regular hexagonal honeycomb with a 3-arm primitive unit cell (something like the figure attached; the figure is only representative and not drawn to scale). The...

07 August 2024 1,937 1 View

Are air moisture harvesting technologies effective in combating desertification?

Air moisture harvesting Air water collection devices

06 August 2024 5,473 2 View

Best mask design for metal deposition aiming build a Perovskite solar cell device?

What types of mask designs for metal deposition, to be used in a PVD system, are best suited for perovskite-based solar cells?

31 July 2024 4,835 3 View

Why only alpha wave of brain are found in some patients?

I have found an EEG where only alpha waves are present. Beta waves are not found in active patients. What interpretations ?

26 July 2024 4,741 1 View

Is the zero-zero component of the metric tensor equal to 1 for accelerating reference frames?

Consider the case of negligible gravity but there is an accelerating reference frame. Its origin traces out a trajectory, or world line, seen in some inertial reference frame. The Lorentz metric...

24 July 2024 1,608 15 View

Did Einstein misunderstand the photo-electric effect?

Photo-electric effect A light particle moving towards a surface cannot (by collision) force an electron particle to move away from that surface. A light wave can instead make interference with a...

19 July 2024 8,389 9 View

Charge transfer characteristics of inverted perovskite leds?

When testing devices based on ITO/ZnO/CsPbBr3/TFB/MoO3/Ag structures, I found that the current density of the device always increases sharply to 1000mA/cm2 at about 3V bias, and the device does...

16 July 2024 4,291 0 View

How to find peak period and significant wave height for a particular location in ocean?

I want to develop the figure like attached figure. How can I get, peak period and significant wave height at any given location.

13 July 2024 886 2 View

Possible reasons for not getting wake effects in free surface?

Hi, I am trying to simulate a ship in a canal. The top width of the canal is 20m, bottom width is 6m, depth is less than 5m. Ship has a length of 11.7m breadth of 4m, draft is 0.62m. The velocity...

10 July 2024 1,732 4 View

Nahuel Vega

You can buy a fresnel lens on EBay

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR12.TRC2.A0.H0.Xfresnel+lens.TRS0&_nkw=fresnel+lens&_sacat=0

Abdul Majeed Khan

Dear Vega:

Thanks for nice information. What will be the cost of 60 INCH Fresnel lens including its transport.