Do Now 1 Light passes from air into
- Slides: 12
Do Now: 1. Light passes from air into some corn oil used for baking. What is the velocity of light in corn oil? How does this compare to light in glycerol? 2. What class and type of wave is light? 3. What does it mean for light to be polarized?
Aim: How Can We Determine How Much Light Is Bent?
How does the speed of light in two mediums relate to each other? Lets look at light traveling in two different mediums, shall we? What is missing? Why? FREQUENCY IS CONSTANT
Sample Problems If a light ray from air travels into water and the water has an index of refraction of 1. 33, then what is the speed of light in water? What is the wavelength in water if it’s 600 nm in air?
Describe what’s happening! • The incident ray of light slows down in the medium • The wavelength is shorter in the different medium • The frequency remains constant!
Snell’s Law (Law of Refraction) • Helps us determine how much light bends!
How Much Does Light Bend? n 1=Air n 2=Water
Law of Refraction: Snell’s Law • As waves enter a new medium they BEND • Moving into a SLOWER medium bends a wave TOWARD the normal and wavelengths SHORTEN • Moving into a FASTER medium bends a wave AWAY from the normal and wavelengths LENGTHEN In either case, FREQUENCY IS CONSTANT
Example #1 A ray of light with a frequency of 5 x 1014 Hz moves from air into a piece of flint glass. The ray strikes the glass at an angle of 50º with the normal. What happens to this ray of light and calculate the refracted angle in the flint glass. Normal Air n 1 = 1. 00 Flint Glass n 2 = 1. 66 50° θ 2 Partial Reflection
White Board Activity • Using the white boards, answer the following parts of the question given.
Example #2 A ray of violet light (7. 69 x 1014 Hz) moving through diamond enters water at an angle of 30º relative to a normal drawn from its point of entry. d) c)a)Calculate What Determine willthe bethe angle thewavelength speed wavelength the of light will when the bend light itat isin when thediamond itexitsinto b) Calculate ofof the light the water?
Exit Card 1. Describe the Law of Reflection 2. What happens when light hits a bumpy surface? 3. How does a Refracted ray of light behave when it enters a… – Denser Medium? – Lighter Medium? 4. Even when light enters a different medium, what stays constant? 5. How can you calculate the refracted angle of a light ray? 6. What are some other useful equations to keep in mind?
- What happens when light passes from air into water
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