Use these targets, vocabulary, rubrics, examples, and score sheet with the instructor's approved lesson and procedure. This is an assessment companion, not a complete lesson or safety authorization.
By the end of the Microscope unit, a student should be able to:
Five science criteria plus separately reported integration (Page 3).
Carry, illuminate, and focus a real scope — watched live.
The student says why each step protects the scope and sharpens the image (Page 4 anchors).
Contemporaneous record of the setup, what was viewed, and at what power.
You are making a decision, not adding up points. For each criterion, decide whether the work is Developing, Proficient, or Mastery — the column language tells you which. A criterion counts as mastered only when the student can both run the technique and justify why each step protects the instrument and sharpens the image. Each student has three tokens per term; each token retries one rubric criterion. Approved accommodations, equipment failures, and approved absences are handled separately and do not consume these tokens.
Accept listed synonyms; use the distinction column to resolve near-matches.
| Canonical answer | Accepted synonyms | Common confusion / discriminator |
|---|---|---|
| The optical path | ||
| Ocular | eyepiece; the top lens | Usually 10×; you look through it — not the objective |
| Objective | the lens near the slide | Comes in a set (4×, 10×, 40×); the nosepiece turns them into place |
| Nosepiece | revolving turret | Holds and swaps the objectives; click each one fully into place |
| Condenser | under-stage lens | Focuses light onto the specimen — not the same as the diaphragm |
| Light & focus | ||
| Iris diaphragm | aperture; contrast control | Changes contrast, not brightness; close it a little for faint specimens |
| Illuminator | lamp; light source | Sets brightness; the diaphragm sets contrast — two different jobs |
| Coarse focus | big knob | Low power only; never on high power — it can crash the lens into the slide |
| Fine focus | small knob | The only knob to use once you step up past low power |
| Stage & specimen | ||
| Mechanical stage | stage controls; x-y knobs | Moves the slide smoothly; don’t shove the slide by hand |
| Stage clips | slide holders | Hold the slide steady; seat it before raising magnification |
| Low power | scanning objective; 4× | Always start here to find and center the specimen |
| Working distance | lens-to-slide gap | Shrinks as power rises — why you focus away from the slide, not toward it |
Work down the criteria one at a time. Watch the procedure, not just the final image — did the student start on low power, focus away from the slide, and step up on fine focus only? Getting an image is Proficient; getting it the safe way, and saying why, is Mastery.
| Criterion | Developing | Proficient | Mastery |
|---|---|---|---|
| Parts & their jobs | Cannot reliably name the objectives, condenser, diaphragm, or focus knobs, or say what each does. | Names most parts but confuses coarse vs. fine focus, or what the diaphragm changes. | Names every part on sight and states its job — objectives, stage and clips, condenser, iris diaphragm, coarse and fine focus. |
| Carrying, storage & care | Grabs the scope one-handed or leaves it on high power; wipes lenses with a shirt or paper towel. | Carries and stores it correctly when reminded, but forgets to return to low power or to use lens paper. | Carries with two hands (arm and base), stores on the lowest objective with the cord wrapped, and cleans optics only with lens paper. |
| Illumination & contrast | Leaves the light at one setting and ignores the diaphragm; the image is washed out or too dark to read. | Adjusts brightness but not the diaphragm, so faint specimens stay invisible. | Sets the lamp and works the iris diaphragm to bring out contrast without glare, retuning it for each specimen. |
| Focusing procedure | Focuses down toward the slide on high power — risking a cracked slide or a scratched objective. | Starts on low power but reaches for the coarse knob on high power, or racks the wrong direction. | Starts on the lowest objective, focuses coarse-then-fine while moving away from the slide, then steps up through objectives on fine focus only. |
| Centering, scanning & the mechanical stage | Raises magnification before finding or centering the specimen and loses it off the field. | Centers on low power but drives the stage jerkily and drifts off the target. | Finds and centers the specimen on low power first, then scans smoothly with the mechanical stage as magnification climbs. |
| Integration (cross-domain) | Makes no supported connection between the source and the science. | Uses the source but needs help connecting evidence, writing, or limitations to the science. | Independently connects History, Reading, and Writing using a cited source, appropriate evidence, a limitation, and a scientific explanation. |
Read these before you grade. They show what Mastery and Developing actually sound like, plus the edge cases where you should coach rather than decide on the spot.
Student: ______________________________________ Date: _______________ Guide: _________________________
| # | Criterion | Decision | Notes |
|---|---|---|---|
| 1 | Parts & their jobs | Dev / Prof / Mast | |
| 2 | Carrying, storage & care | Dev / Prof / Mast | |
| 3 | Illumination & contrast | Dev / Prof / Mast | |
| 4 | Focusing procedure | Dev / Prof / Mast | |
| 5 | Centering, scanning & the mechanical stage | Dev / Prof / Mast | |
| 6 | Integration (cross-domain) | Dev / Prof / Mast |
☐ No ☐ Yes — for criterion: __________
Tokens left this term after this session (choose one): ☐ 3 ☐ 2 ☐ 1 ☐ None left
Dev = Developing · Prof = Proficient · Mast = Mastery · Unsure between two levels? Circle the lower one and note what a re-do would need.