For optically active substances

Slides:

Advertisements

Similar presentations

24.6 Diffraction Huygen’s principle requires that the waves spread out after they pass through slits This spreading out of light from its initial line.

Advertisements

Fundamentals of Photoelasticity

HEAT, LIGHT, SOUND SCIENCE LANGUAGE AND VOCABULARY.

POWERPOINT PRESENTATION ON POLARISED MICROSCOPE

Visible Light Spectrum Britney Koetsier Nicole Podnecky.

Electromagnetic Waves Physics 202 Professor Vogel (Professor Carkner’s notes, ed) Lecture 12.

Polarization of Light Waves

Chapter 24 Wave Optics.

PERIPHERAL VISION 1.Take off your glasses if you wear them. 2.Stare straight ahead at the blackboard. 3.Close your right eye. 4.Hold the index finger.

When light passes from vacuum (index of refraction n = 1) into water (n = 1.333), Q33.1 A. the wavelength increases and the frequency is unchanged. B.

What is Spectroscopy? The study of molecular structure and dynamics through the absorption, emission and scattering of light.

Welcome to Optics JEOPARDY PHysics Final Jeopardy Question Reflection Mirrors 100 Lens refraction Special topics.

c = km/sec I F = I 0 x (cosθ) 2.

Circular Dichroism Part I. Introduction.

9.12 Diffraction grating • Order of diffraction

Reading Activity Questions? IB Assessment Statements Topic Polarization: Describe what is meant by polarized light Describe polarization.

Transverse wave is a wave in which the direction of displacement is perpendicular to the direction of propagation, as a surface wave of water.

Isotropic vs Anisotropic

Polarization Polarization is a characteristic of all transverse waves.

Introduction to Instrumental Analysis - Spectrophotometry

Aim: What happens to the speed of light in different mediums? Do Now: What is the wavelength of yellow light? v = f λ c = f λ 3 x 10 8 m/s = (5.20 x 10.

Chapter 5 Jones Calculus and Its Application to Birefringent Optical Systems Lecture 1 Wave plates Wave plates (retardation plates) are optical elements.

Topic 11: Wave phenomena 11.5 Polarization

1 GEOMETRIC OPTICS I. What is GEOMTERIC OPTICS In geometric optics, LIGHT is treated as imaginary rays. How these rays interact with at the interface of.

Identification of minerals with the petrographic microscope

Optics 2: REFRACTION & LENSES. REFRACTION Refraction: is the bending of waves because of the change of speed of a wave when it passes from one medium.

C H A P T E R 26 The Refraction of Light: Lenses and Optical Instruments.

Ch23 Geometric Optics Reflection & Refraction of Light.

Chapter 23. Ray Optics Our everyday experience that light travels in straight lines is the basis of the ray model of light. Ray optics apply to a variety.

Properties of Chiral Molecules: Optical Activity

Optical Density - a property of a transparent medium that is an inverse measure of the speed of light through the medium. (how much a medium slows the.

1 Optical Properties of Minerals GLY 4200 Fall, 2012.

 Is an instrumental analytical method using rotation of polarized light by some substances as measure of their concentration in a solution.  The instrument.

Chapter 44 Polarization. Content of this Chapter About polarization Polarizing sheets Polarization by reflection Double refraction Circular polarization.

Optically Active Substances Page 234. Optically active substances are Materials that rotates the plane of incident plane polarized light is optically.

1© Manhattan Press (H.K.) Ltd. Young’s double slit experiment Young’s double slit experiment 9.10 Interference of light waves Relationship between x,,

principle  measures the extent to which light is bent (i.e. refracted) when it moves from air into a sample and is typically used to determine the index.

Chapter 24 Wave Optics Conceptual Quiz Questions.

Is the velocity of the wave shown above. For reflection of light, we have the situation shown in Figure 1. The two plane mirrors in Figure 2 are at 90.

SPECTROPHOTOMETRY. Spectrophotometry Determines concentration of a substance in solution –Measures light absorbed by solution at a specific wavelength.

Wave Optics Light interferes constructively and destructively just as mechanical waves do. However due to the shortness of the wave length (4-7 x

Conditions for Interference

Retarders This is a class of optical devices which introduce a phase difference between extra-ordinary and ordinary rays. These are in the form of plates.

Color Polarization Reflection and Refraction Snell’s Law….

Color and Polarization. Color Determined by frequency of light reaching the eye Hot bodies produce different frequencies of light depending on temp. -

Chapter 9.6 Polarization. Simple concepts of Polarization Waves on a string Diagram of vertical wave on a string (string is always in the vertical plane)

Spectrophotometry at a Glance

Final Exam (chapters since Exam#2). time: Friday 05/03 3:30 pm- 5:30 pm. Location: room 114 of physics building. If you can not make it, please let me.

Speed of light In a vacuum, light travels at a speed of 3 x 10 8 m/s. In any other medium, such as air, water, glass, etc., light travels slower. MaterialSpeed.

Physics REVISION – Light - Reflection The law of reflection Sound waves and light waves reflect from surfaces. The angle of incidence equals the angle.

Experiment (6) : Kinetic Study of inversion of cane sugar catalyzed by an acid Theory In chemistry, specific rotation ([α]) is a property.

Optical Properties of Minerals

Introduction to Spectrophotometry

Introduction to Spectrophotometry

A. WAVE OPTICS B. GEOMETRIC OPTICS Light Rays

Chapter 5 Jones Calculus and Its Application to Birefringent Optical Systems Lecture 1 Wave plates Wave plates (retardation plates) are optical elements.

Color and Polarization

The Refraction of Light

Announcements I should have exams back to you on Fri.

The law of reflection: The law of refraction: Image formation

Color and Polarization

OBJECTIVE QUESTIONS FOR NEET AIIMS JIPMER

The Refraction of Light

Presentation transcript:

For optically active substances This is equation of straight line inclined at /2 with x-axis. That is with the vibrations of incident light.

For optically active substances

Practice Problem

Specific rotation for liquids The specific rotation of an optically active substance at a given temperature for a given wavelength of light is defined as the rotation (in degrees) produced by the path of one decimeter length in a substance of unit density (concentration) The unit of specific rotation is deg.(decimeter)-1(gm/cc)-1 The molecular rotation is given by the product of the specific rotation and molecular weight of the substance.

Specific rotation for solids The specific rotation of an optically active solid substance at a given temperature for a given wavelength of light is defined as the rotation (in degrees) produced by the path of 1 mm length in a substance. Specific rotation for liquids The specific rotation of an optically active liquid at a given temperature for a given wavelength of light is defined as the rotation (in degrees) produced by the path of 1 deci-meter length in a substance with density 1gm/cc.

A quartz plate cut perpendicular to the optic axis is to be used to rotate the plane of polarized light through an angle of 900. The refractive indices of quartz for right and left handed circularly polarized light of wavelength 7620 Å are 1.53914 and 1.53920 respectively. Find its thickness. 2. If 20 cm length of a certain solution causes right handed rotation of 420 and 30 cm length of another solution causes left handed rotation of 270 . What optical rotation will be caused by 30 cm length of a mixture of the above solutions in the volume ratio 1 : 2. The solutions are not chemically active.

Polarimeters A device designed for accurate measurement of angle of rotation of plane of vibration of a plane polarized light by an optically active medium is said to be a polarimeter. Two Types: Laurent's Half shade polarimeter Bi-quartz polarimeter

Laurent's Half shade polarimeter V2 T Two nicols- N1 AND N2 Half shade device-H Telescope-T Glass tube-T1 V1 Nicol N2 can be rotated and its position can be noted on a circular scale with verniers V1 and V2 Monochromatic light after passing through N1 become plane polarized with its vibrations in principal plane of nicol.

Laurent's Half shade polarimeter

Laurent's Half shade polarimeter

Laurent's Half shade polarimeter

Laurent's Half shade polarimeter

Laurent's Half shade polarimeter

Laurent's Half shade polarimeter

Laurent's Half shade polarimeter

Laurent's Half shade polarimeter

Half shade device (H) Y  O X C SPECIFIC ROTATION Where l is length of tube T1 in cms.

Bi-quartz Device White light source is used. Two semicircular quartz plates (Right and Left handed) with Optic axis perpendicular to crystal surface (rotation effect only). Device is designed for yellow color. YY’ is tint of passes If Analyzer axes is perpendicular to YY’ then yellow color will be disappeared and we can get resultant of Red and Blue colour (Reddish violet color) as min intensity. This is much more sensitive and accurate then Half shade device polarimeter. But having major drawback for color blindness person.

Bi-quartz Device Right handed Quartz Left handed Quartz

Bi-quartz Device

Bi-quartz Device White light source is used. Two semicircular quartz plates (Right and Left handed) with Optic axis perpendicular to crystal surface (rotation effect only). Device is designed for yellow color. YY’ is tint of passes If Analyzer axes is perpendicular to YY’ then yellow color will be disappeared and we can get resultant of Red and Blue colour (Reddish violet color) as min intensity. This is much more sensitive and accurate then Half shade device polarimeter. But having major drawback for color blindness person.