Developed during the 16th century, allowed projected images to be focused.

Developed during the 16th century, lens allowed projected images to be focused. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. They are part of the camera and serve to better define the image.

The positive impact of the industrial revolution has brought about a lot of positive effects on the industrial revolution. These include increased wealth, increased production, and improved living standards. People can get healthier meals, better dwelling, and cheaper items. Furthermore, education has increased during the Industrial Revolution. For one reason Edward Jenner invented the smallpox vaccine and bacteria found in Louis Pasteur, medical treatment has increased and people have begun to extend their lives. The middle class and the upper class immediately benefited from the Industrial Revolution. It took more time for the workers. However, in the 19th century, workers formed unions and got higher wages and better working conditions. As a result, they began to benefit from the industrial revolution.