Lenses and Light

👓How do Glasses work?

Hi everyone, now that you have mastered your understanding of how light waves work, We will explore why we need to understand the nature of light. Ever wondered how those glasses on your nose help you see the world more clearly? Well, hold onto your frames, as we dive into the science behind your specs!

🌍1. World of lenses (Click heading for extension reading): 

There are two main actors on the stage: the convex lens and the concave lens. Each plays a unique role, bending light in special ways to give you a clearer view of the world.

🔍2. Convex lens- The magnifier: 

• Shape: Like a pancake, a convex lens is chubby in the middle and slender at the edges.
• Example: A magnifying glass! Ever notice how it's plump in the centre and thin towards its rim?
• The magic trick: It makes things appear bigger! But there is a twist in the plot! Move it further from the object, and the image might just flip upside down and shrink. This is called a real image.
• Image explanation: The magnifying glass funnels light rays to converge, bending them inward. So, while the black lines show the light's true path, the red dashed lines show where our eyes think the light is coming from, making things look much bigger!

From: Roberts, E., Humphreys, C., & Shaw, V. (2019). Cambridge Science for Victorian Curriculum. Cambridge University Press.

🔍3. Concave lens - The minimiser:

• Shape: Imagine a tiny valley! Concave lenses are slender in the middle and plump around the edges.
• The Magic trick: This lens does the opposite of its convex cousin - it makes images appear SMALLER.
• Image explanation: A concave lens is a bit rebellious. It causes light rays to scatter or diverge, bending them outward. The black lines show the actual path, but the red dashed ones? That's where our eyes perceive the light to be coming from, giving the illusion of a smaller image.

From: Roberts, E., Humphreys, C., & Shaw, V. (2019). Cambridge Science for Victorian Curriculum. Cambridge University Press.

So, the next time you put on your glasses or see someone with them, you'll know the technology behind each glance and the science that makes our vision a bit more clear. 

Look at the Infographic: The fascinating science behind how glasses work and observe the similarities with what have you learned so far

From:https://socialbarrel.com/the-fascinating-science-behind-how-glasses-work-infographic/109892/