# 1.1: Pre-lab Exercises

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## Safety, Polarization States of Optical Waves, Dielectric Reflection and Geometric Optics

The Pre-Lab Exercises must be completed BEFORE entering the Lab. In your lab notebook record data, explain phenomena you observe, and answer the questions asked. Remember to answer all questions in your lab notebook in a neat and orderly fashion. No data are to be taken on these laboratory sheets. Tables provided herein are simply examples of how to record data into your laboratory notebooks. Expect the in-lab portion of this exercise to take about 3 hours.

### PL 1.1 - Safety

Read the entire Laboratory and laser Safety Packet that was handed out in the classroom. Be prepared to answer questions about high-voltage and laser safety before arriving at the MOL.

### PL 1.2 - Get Prepared to Start the Laboratory Exercises

Read the entire laboratory handout, and be prepared to answer questions before, during and after the lab session. Determine all the equations and constants that may be needed in order to perform all the laboratory exercises. Write them all down in your laboratory notebook before entering the Lab. This will ensure that you take all necessary data while in the Lab in order to complete the lab write-up. This preparatory work will also count toward your Lab Exercise grade.

### PL 1.3 - Telescope Design

##### TABLE 1. Optical elements available for building your telescope:
 Size Type Focal Length Quantity 2'' Bi-Convex 200 mm 1 2'' Bi-Convex 100 mm 2 2'' Bi-Convex 75 mm 1 1'' Bi-Convex 200 mm 1 1'' Bi-Convex 150 mm 1 1'' Bi-Convex 100 mm 1 1'' Bi-Convex 75 mm 1 1'' Bi-Convex 50 mm 1 1'' Bi-Convex 35 mm 2 1'' Bi-Convex 25.4 mm 2 1'' Bi-Concave -100 mm 1 1'' Bi-Concave -75 mm 1 1'' Bi-Concave -50 mm 1 1'' Bi-Concave -25 mm 1

Hints: Remember to use larger lenses at the input of your system (the side facing the world), and smaller lenses close to the eye. Also, before you start designing, determine which element in the ABCD matrix must equal zero for angular magnification to occur.

### PL 1.4 - Extra Credit (Not Required)

Design a zoom-optic system with the components listed above. (With a zoom-optic system, you can adjust the magnification of your telescope by moving a central lens while keeping the outer most lenses at approximately the same location – basically the same setup as is used in an SLR camera zoom lens.)

“Two brothers bought a cattle ranch and named it "Focus." When their father asked why they chose that name, they replied: "It's the place where the sons raise meat." -- Prof. W. B. Pietenpol, Physics Department, University of Colorado, Boulder, Colorado

This page titled 1.1: Pre-lab Exercises is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by David Dunmeyer (MIT OpenCourseWare) .