Physical Science: Optics Outcome C2 – Continued

Refraction and Reflection When a ray of light, hits a surface, it will either be refracted, reflected or both will occur. How do we know which will happen? ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER TIME IS UP 30 SECONDS LEFT Depends on the transparency of the object Light will only reflect and not be able to refract if it is opaque

Refraction and reflection What are some objects that will allow light to reflect off of, and refract through? Think of 3 examples ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER TIME IS UP 30 SECONDS LEFT

Reflection Light moves in straight lines This can be demonstrated with simple experiments

Reflection Incident ray – The ray of light that is coming from a light source Normal – an imaginary line perpendicular to a surface that a ray of light reflects off of Reflected ray – the ray of light that bounces off of a surface

Reflection Will the source of light be on the right side of the normal? Or the left? Draw it in

Reflection Angle of Incidence – This is the angle (can be measured) the incident ray makes with the normal Angle of Reflection – This is the angle the reflected ray makes with the normal

Reflection Where should the angles be measured from?

Reflection Plane mirror vs. Curved mirrors A plane mirror, is a flat mirror. Ex: Bathroom mirrors, rear view mirror

Reflection A curved mirror can be any of two types: Concave mirrors – Have a reflecting surface that curves inward. Imagine the inside of a bowl Ex: Spoons, satellite dishes, flashlights

Reflection Convex mirrors – Have a reflecting surface that curves outward. Imagine the outside of a bowl Ex: Safety mirrors on trucks and busses, side-view mirrors on cars

ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER Refraction Define Refraction ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER TIME IS UP 30 SECONDS LEFT The bending (or change in direction) of a wave as it moves from one medium into another

ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER Refraction What are some common places where we will observe refraction? List 3 ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER TIME IS UP 30 SECONDS LEFT

Refraction When light travels from a less dense medium into a denser medium, it bends toward the Normal

Refraction When light travels from a more dense medium into a less dense medium, it bends away from the Normal

Refraction

Physical Science: Optics Outcome C3 – Comparing visible light to other types of electromagnetic radiation

Review: Electromagnetic radiation Electromagnetic radiation is the transmission (movement) of energy in the form of waves. These waves range from long radio waves to very short gamma rays The electromagnetic spectrum is the range of energies that include long radio waves, microwaves, infrared waves, visible light waves, ultraviolet waves, X-rays and gamma rays.

Electromagnetic spectrum

TURN TO YOUR PARTNER (TTYP) Question: Wavelengths longer than visible light include????? Radio waves, microwaves, infra-red waves Wavelengths shorter than visible light include????? UV rays, x-rays, gamma rays

Electromagnetic radiation – WHAT IS IT EVEN GOOD FOR?! Other types of electromagnetic radiation include: Radio waves microwaves

Electromagnetic radiation – WHAT IS IT EVEN GOOD FOR?! Other types of electromagnetic radiation include: Infrared Ultraviolet

Electromagnetic radiation – WHAT IS IT EVEN GOOD FOR?! Other types of electromagnetic radiation include: X-rays gamma rays

Electromagnetic radiation How are these different? TURN TO YOUR PARTNER AND ANSWER: What 3 differences does electromagnetic radiation have from one another… For example, when you compare UV rays to Radiowaves ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER TIME IS UP 30 SECONDS LEFT