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Hologram Technology

Definition:
Holography is a technique that records and reconstructs three-dimensional (3D) images by capturing both the intensity and phase of light waves using coherent light (laser).

Principle:
Based on Interference of Light and Diffraction of Light.
A laser beam is split into:
Object beam (reflected from object)
Reference beam (direct)
Their interference pattern is recorded on a photosensitive medium.
When illuminated, it reconstructs a 3D virtual image with depth and parallax.

Applications (with examples):
1) Security: Holograms on currency notes, passports, credit/debit cards to prevent counterfeiting
2) Medical field: 3D visualization of organs for surgical planning and diagnostics
3) Telecommunication: Holographic telepresence (virtual meetings, remote interaction)
4) Entertainment: Virtual performances (e.g., deceased artists recreated on stage)
Data storage: Holographic data storage systems with high capacity
5) Defense: Simulation, battlefield visualization, pilot training.

Remembering the great personality, humanist, and architect of our nation, Babasaheb DR B. R. Ambedkar, on his birth anniversary, who worked relentlessly to uplift the poor, downtrodden, and vulnerable sections of society.

Here is the IR and Geography Maps Quick Revision material

Going to be a historic moment. At the same time, if poor and middle-class people get more opportunities in politics, it will truly lead to a more positive outcome for India’s democracy and its future.

Apples are being grown in Anantapur, Andhra Pradesh. Growing them in such a hot, dry area where temperatures can go up to 45°C really shows how much crop biotechnology has improved.

Looking for UPSC Prelims and Mains content writer.

Those who have given UPSC Mains at least once and not appearing for 2026 may message this number 93118 40789.

Vacancy -01

Here is the SADHYAM Science and Technology Quick Revision Material for Prelims 2026. It covers PYQs, current affairs, and basic concepts in one place. Its major objectives is to provide the right direction and improve your overall score.

Vacancy is still opened.
Eligible people may apply
You message to the WhatsApp number given.

The last book i.e Environment of SADHYAM Prelims 2026 Quick Revision Material will be released Today or Tomorrow.
We are trying our best to make it easy and convenient to read.

Those who have seen and read Economy, IR and Mapping, and Science and technology may give feedback regarding the books and content.

Some students are asking can we rely on your books completely.

I would never say one book or books will give complete knowledge for the exam.

Just use them as per your needs and leave what is not required for you.
You should show discretion while reading any content or book.
You should select what to read and what not to read from any institute book or material.

Here is the SADHYAM Prelims 2026 Environment Quick Revision Material, covering previous years’ content, current affairs, and basic concepts. We have tried our best to present the right content in a simple and easy-to-understand manner. However, as mentioned earlier, do not depend entirely on any single source. Use these materials according to your requirements and your understanding of PYQs. Conceptual clarity, confidence, and common sense are equally important for this exam. Do multiple Revisions. Keep working hard.

Remembering the great saint Basavanna on his Jayanti, who tirelessly fought for human dignity, equality, and social justice. Har Har Mahadev 🙏

Preparation Reminder

Those who are preparing for 2026 Attempt should focus on Revision and at the same time don't read new content.

Those who are planning for 2027 or 28
Focus on Finishing Mains Syllabus, Notes making and Answer writing. Try to write a Mains test series before December. Also don't forget to read Newspaper everyday.

I know these days before Prelims are very stressful. So many thoughts will be coming, especially for those who have been preparing for years and faced failures.

Let me tell you one thing.
We are all here for some reason. Even if we fail in something, we may succeed in something bigger.

When I cleared the exam two years ago, I was very happy. But after a few days, I came to know that I would be getting IRS. I felt a little disappointed because I couldn’t get IAS or IPS.
After a few months, even that IRS didn’t work out. After so many years of struggle, again I had to fight for my service in the courts.

At that time, I didn’t understand why all this was happening to me. But now, when I look back, I feel it gave me a bigger role as a mentor.
A few years down the line, if I see my students whom I taught how to study, how to write, and everything about UPSC getting into IAS or IPS, that will be a bigger achievement for me.
So don’t think too much about results. Just focus on your preparation.

Anything can happen in life. Our duty is to do our work and leave the rest.