The Strehl ratio is a measure of the quality of optical image formation, originally proposed by Karl Strehl, after whom the term is named. Used variously in situations where optical resolution is compromised due to lens aberrations or due to imaging through the turbulent atmosphere, the Strehl ratio has a value between 0 and 1, with a hypothetical, perfectly unaberrated optical system having a Strehl ratio of 1. (Wikipedia).
Camera Mirror Lenses Part 1: Visual and Interferometric Testing
In this video I will discuss the visual and interferometric tests of camera mirror telephoto lenses. Contents: 0:00 intro 1:16 Vivitar f=800mm F:8 mirror lens 4:58 Sigma f=600mm F:8 mirror telephoto 7:34 Soligor f=500mm F:8 mirror lens 8:26 Explaining interferometry in auto-collimation 12
From playlist optics
Making a Mirror with a Variable Surface Shape
Some concepts in this video have been pictured in a somewhat simplified manner to make it more accessible to a less specialized audience. Contents: 00:00 General intro 00:56 Conic constant explained 10:00 Explanation of the manufacturing process 12:25 Testing the mirror 15:32 interferom
From playlist optics
This video defines a ratio and provides several examples on how to write a ratio and shows how to simplify a ratio. http://mathispower4u.wordpress.com/
From playlist Ratios and Rates
This video introduces the Golden ratio and provides several examples of where the Golden ratio appears. http:mathispower4u.com
From playlist Mathematics General Interest
Ratio conversions and cross multiplying | U1 | ATAR Chemistry QCE
ATAR Chemistry for the QCE Y11 U1 T3 Chemical Reactions - Ratio conversions and cross multiplying A key skill to making Stoichiometry and unit conversions easy and correct is using cross multiplying of ratios - either Stoichiometric ratios from the balanced equation or the ratio for conver
From playlist Topic 1 Stoichiometry - at a slower pace...
How to Convert Fahrenheit to Celsius
Please Subscribe here, thank you!!! https://goo.gl/JQ8Nys How to Convert Fahrenheit to Celsius
From playlist College Algebra
This is a short video tutorial on equivalent ratios. ✤ ✤ ✤ INTERACTIVE APPLETS AND WORKSHEETS ✤ ✤ ✤ http://fearlessmath.net ✤ ✤ ✤ FOLLOW ME ON TWITTER ✤ ✤ ✤ http://twitter.com/dhabecker
From playlist All about ratios and proportions
Ratios Introduction - what are ratios?
Ratios are used to compare different quantities. In this introduction to ratios we will look at what ratios are, how we deal with ratios of different measurement units and that ratios can be simplified. To donate to the tecmath channel:https://paypal.me/tecmath To support tecmath on Pa
From playlist Ratios
Convert Ratios to Percents and Simplfied Fractions (35 to 100 and 48 to 50)
This video explains how to convert ratios to a percent and a simplified fraction. http://mathispower4u.com
From playlist Introduction to Percentages
This video explains how to use fundamental analysis to determine if a company may be undervalued or overvalued by using valuation ratios such as the price to book ratio, price to sales, & price to earnings ratio. It also explains how to determine if a company may go bankrupt using the deb
From playlist Stocks and Bonds
Managerial Accounting by Dr. Varadraj Bapat,Department of Management,IIT Bombay.For more details on NPTEL visit http://nptel.ac.in
From playlist IIT Bombay: Managerial Accounting | CosmoLearning.org Accounting
This video defines a proportion and explains how to solve a proportion. http://mathispower4u.wordpress.com/
From playlist Proportions
Combining Ratios & Three Part Ratios (Part 2) | Grade 5+ Series | GCSE Maths Tutor
A video revising the techniques and strategies for combining 3 part ratios (Part 2) - Higher and Foundation. This video is part of the Ratio & Proportion module in GCSE maths, see my other videos below to continue with the series. Revision videos: The Entire GCSE in Only 2 Hours!! Highe
From playlist GCSE Maths Videos
Ratio and Proportion - Exam Questions (harder - higher tier)
GCSE ratio maths exam question practice taken from past papers and practice papers. This video is suitable for Higher tier only. See https://youtu.be/dHMm15qUll8 for more mensuration questions that appear on both Higher and Foundation tier papers. Keywords: ratio, unitary method Help rev
From playlist OCR Higher Paper 4 - Advance Information and Additional Resources- GCSE Maths May 20 2022
Sharing into a Ratio | Revision for Maths GCSE and IGCSE
I want to help you achieve the grades you (and I) know you are capable of; these grades are the stepping stone to your future. Even if you don't want to study science or maths further, the grades you get now will open doors in the future. Tutoring - We can match you with an experienced t
From playlist Edexcel GCSE Maths Revision
Understanding, Simplifying & Combining Ratios
"Understand, simplify and combine ratios, or work out quantities of items needed to obtain a given ratio."
From playlist Number: Ratio & Proportion
Mod-07 Lec-18 Financial Statements Analysis - Dabur India Case
Managerial Accounting by Dr. Varadraj Bapat,Department of Management,IIT Bombay.For more details on NPTEL visit http://nptel.ac.in
From playlist IIT Bombay: Managerial Accounting | CosmoLearning.org Accounting
Convert a Decimal to a Percent and a Fraction
This video explains how to convert a decimal to a percent and a fraction. http://mathispower4u.com
From playlist Introduction to Percentages
