The international society of optics and photonics (SPIE) has provisioned free printed photos for educators. The posters are around the topics of optics and photonics, and moreover sustainable development goals (SDGs).
You can order upto a total of 5 posters from a wide range of collection of posters so that you do not have to pay shipping fees. However, a shipping fees will be charged for order of more than 5 posters.
The posters have to be ordered for awareness and educational purposes. You can especially benefit if the posters natch your teaching and learning contents. The posters on 17 sustainable development goals (SDGs) are worth ordering for free. SDGs are being part of school and university curriculum. The specific goals of SDGs are expected to be achieved by 2030. The posters can also be used in libraries and offices of NGOs / Schools.