# ALEX Classroom Resource

## Optical Instruments: Crash Course Physics #41

Classroom Resource Information

Title:

Optical Instruments: Crash Course Physics #41

URL:

https://www.pbs.org/video/optical-instruments-crash-course-physics-41-ztlrcq/

Content Source:

PBS
Type: Audio/Video

Overview:

How do lenses work? How do they form images? Well, in order to understand how optics work, we have to understand the physics of light. In this episode of Crash Course Physics, Dr. Shini talks to us about optical instruments and how they make magnification possible.

Content Standard(s):
 Science SC2015 (2015) Grade: 9-12 Physics 10 ) Plan and carry out investigations that evaluate the mathematical explanations of light as related to optical systems (e.g., reflection, refraction, diffraction, intensity, polarization, Snell's law, the inverse square law). Unpacked Content Scientific And Engineering Practices:Planning and Carrying out InvestigationsCrosscutting Concepts: Cause and EffectDisciplinary Core Idea: Waves and Their Applications in Technologies for Information TransferEvidence Of Student Attainment:Students: Based on evidence from investigations, students can trace the path of light refracted through a lens or reflected off a mirror and find the focal point. Based on evidence from investigations, students determine the relationship between intensity and distance from a light source. Experimentally demonstrate Snell's Law. Experimentally demonstrate the mirror and lens equations.Teacher Vocabulary:medium model graph image distance object distance focal point magnification critical angle refraction reflection diffraction interference constructive interference destructive interference principal axis center of curvature intensity inverse angle of incidence angle of reflection angle of refraction index of refraction speed of light system velocity polarization minima maxima order slit width slit separation object image real virtual inverted erect spherical aberration chromatic aberration total internal reflection law of reflection Snell's lLaw prism ray concave convex plane divergent convergent ray diagramsKnowledge:Students know: How light interacts at boundaries of different media. The wave properties of light. Basic trigonometric equations. How to do graphical analysis. Inverse and inverse square relationships. Types of images and how images are formed. Appropriate units of measure. How to identify a system.Skills:Students are able to: Develop an appropriate experimental procedure. Create a data sheet. Collect and organize experimental data. Follow written and verbal instructions. Make measurements using standard units. Effectively manipulate laboratory equipment. Work safely in collaborative lab groups. Manipulate equations. Interpret graphical data. Solve mathematical equations. Draw a light ray diagram and identify the location of an image.Understanding:Students understand that: The behavior of light is predictable mathematically allowing the development of optical devices to improve vision macroscopically and microscopically.AMSTI Resources:ASIM Module: This standard is related to standard 8—waves and should be a continuation of the discussion of waves. Light is discussed in earlier grades and that learning should be reinforced. This standard does not address color but color should be included when working on this standard. This standard provides examples covering an extremely wide range of optics. In this document, emphasis was placed on refraction and reflection; however, the topics of diffraction and interference should also be considered for historical and mathematical relevance. Illuminance; Plane and Curved Mirrors; Concave Mirror; Snell's Law; Convex and Concave Lenses; Convex Lens; Polarized Filters and Meter Basics
Tags: lens, light, microscope, optics, physics, telescope, wave