Consider the following statements regarding Nanotechnology. 1. Nanotechnology is the understanding and control of matter at the Nano scale, at dimensions between approximately 1 and 1000 nanometres. 2. Stained-glass windows are an example of how nanotechnology was used in the pre-modern era. 3. Nanostructured materials can have different magnetic properties compared to other forms or sizes of the same material. Which of the above statement/s is/are correct?

- Statement 1 is incorrect. Nanotechnology is defined as the understanding and control of matter at the nanoscale, typically at dimensions between approximately 1 and 100 nanometres (nm). The range up to 1000 nm (or 1 micrometer) is generally outside the core definition of nanotechnology, although nanoscale effects can be relevant up to that size in some contexts. - Statement 2 is correct. Ancient stained-glass windows used gold and silver nanoparticles to create vibrant colours, demonstrating an early, albeit unintentional, use of nanomaterials. - Statement 3 is correct. Nanostructured materials often exhibit properties (like magnetic, optical, electrical, or mechanical) that are significantly different from their bulk counterparts due to quantum effects and increased surface area-to- volume ratio at the nanoscale.