To verify Snells Law and find the refractive index of glass

Slides:

Advertisements

Similar presentations

BY A GENTLEMAN EXPERIMENTS IN L.C. PHYSICS MEASUREMENT OF THE FOCAL LENGTH OF A CONCAVE MIRROR Given the formula.

Advertisements

Chapter 35 The Nature of Light and the Laws of Geometric Optics EXAMPLES.

Reflection and Refraction Presented by: Chun Yin Fu Xing Zhong Lin SC442, Honors, Fall 2001, Dr. R.Kezerashvili.

Snell's Law Refraction of Light By: Brett Rapponotti and Corrine Yap.

Reflection & Refraction of Light Reflection: specular (mirror) vs diffuse angle of incidence = angle of reflection Refraction: Snell’s Law n 1 sin 

The Professional Development Service for Teachers is funded by the Department of Education and Skills under the National Development Plan By Mark Jordan.

Refraction of light. 1John says, ‘When hunting a fish under water, you should aim your spear directly at the fish.’ Do you agree? Yes, of course. No,

3 Refraction of light 3.1 Refraction of light 3.2 Laws of refraction 3.3 Snell’s law and refractive index 3.4 Refraction through a block 3.5 Refraction.

 A change in the direction of light as it moves from one type of substance into another. Figure 14-5 on p. 399 removed for copyright.

Last lesson Light travels faster than sound Using ray boxes The law of reflection.

P5g - Refraction of waves Refraction is…. Refraction.

Reflection and Refraction. Reflection Two laws of reflection Angle of incidence = angle of reflection The angle of incidence, angle of reflection and.

Higher Physics – Unit Refraction of Light.

Unit – K3 Refraction 25th of May 2007 Form Group 8_y.

Chapter 17 Reflection and Refraction. Ch 17.1 How light behaves at a boundary.

Revision 1.Sketch a wave and mark on it the wavelength and amplitude. 2.What is meant by the frequency of a wave and give its unit? 3.Define the period.

Optics Reflection, Refraction & Snell’s Law Lesson 2

Light & Optics. Law of Reflection The angle of incidence of reflected light equals the angle of reflection.  r =  I Note that angles are measured relative.

Refraction (Slowing Down) When a wave passes into a medium that makes it slow down, the wave will bend toward the normal Air Water.

the change of direction of a ray of light as it passes obliquely from one medium into another of different transmission speed.

Geometric Optics (Lecture I)

Light continued.

LIGHT Reflection and Refraction. Mirrors and highly polished opaque surfaces reflect light in predictable ways.

Light: reflection and refraction Lesson 2. Law of reflection Angle of reflection Angle of incidence The angle of incidence = the angle of reflection.

Refraction. Have you ever seen this? Refraction of Light When light travels through a surface between two different media, the light will be refracted.

What happens when light enters a transparent medium (e.g. water)?

 .  ’’ a    a    ’ + a = 90 Therefore:   =   ’  

DO NOW What is the color of a light wave with a frequency of 5.65 x Hz?

14.1 Bending of light Determining the refractive index of glass In an experiment, a ray of light is directed towards a semi-circular glass block at various.

Snell’s Law. Uses an equation that allows us to calculate how a ray of light will bend as it passes from one medium to another. Deals with the relationship.

PHYSICS – Reflection and Refraction. LEARNING OBJECTIVES Core Describe the formation of an optical image by a plane mirror, and give its characteristics.

REFRACTION Physics Chapter 18b. Refraction Bending rays of light as it passes from one medium to another Caused by change in speed of wave Amount of refraction.

When light enters a more dense material, (e.g. perspex), it will slow down…  This is called Refraction. The speed of light in a vacuum is 3x10 8 ms -1.

Refraction. When light moves from one medium to another the path of the light changes at the boundary between the substances. This change in path is known.

Refraction Lab Use ray tracing and Snell’s Law to determine the refractive index of glass and water.

Light Reflection and Refraction. Reflection Law of Reflection.

Refraction of Light The drawing indicates that compared to blue light, red light moves A. faster in glass. B.slower in glass. C.the same speed in glass.

12.3 Refraction of light Invisible Crystals Introduction

Chapter 17 Reflection and Refraction. When light passes from one medium to another it may be reflected, refracted or both.

Last lesson Refraction of light. Refraction When a wave changes speed (normally when entering another medium) it may refract (change direction)

Total Internal Reflection The Endoscope. You will need… A semicircular block A power pack A ray box A single slit A protractor A ruler A pencil.

Air Liquid A question based on refractive index, Snell’s law, total internal reflection, and some geometry.

Reflection of Light Waves

Aim: How can we apply refraction to a laser beam through a glass block? HW:

What Physics is involved here?

Refraction of Light.

PHYSICS – Total Internal Reflection and Lenses

Grade 11 Physical Science – Mrs KL Faling

How does refraction affect light rays?

Announcements Waves Pt 2. Exam on Monday (18 MC, 2 FR) TC due Tomorrow.

A reminder of the important laws of refraction

10.3a Bending light When a ray of light enters a glass block at an angle to the normal, the angle is called its angle of incidence (i).

Refraction of light.

Chapter 14 Refraction.

Refraction – Snell’s Law

Ch. 6 Refraction (折射).

Ch. 4 Refraction (折射).

REVISION REFRACTION.

MEASUREMENT OF THE FOCAL LENGTH OF A CONCAVE MIRROR

sin i sin r n Using Snell’s Law sin

Light Refraction – the “bending” of light as it passes through a surface from one medium to another When light leaves a less dense media such as air and.

Key areas Absolute refractive index of a material is the ratio of the sine of angle of incidence in vacuum (air) to the sine of angle of refraction in.

REFRACTION OF LIGHT.

The Index of Refraction

light slows down (v<c)

Presentation transcript:

To verify Snells Law and find the refractive index of glass

Method Place a glass block on the paper and mark its outline. Shine a ray of light from a lamp through the block and mark the incident and emergent rays. Remove the glass block. Join where the ray enters and leaves the block. Draw the normal and measure the angle of refraction r and the angle of incidence. Repeat for different values of i. Plot a graph of sin i against sin r.

Results i r Sin i Sin r n The refractive index of glass is equal to the average value of sin i divided by sin r or the slope of the graph.

Precautions Avoid the small angles as they have a greater percentage error. Use a narrow beam of light as its position can be marked more accurately.