10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The TPO exam has 98 questions and runs 2 hours.
These 10 free TPO questions are organized by exam domain, so you can see how each part of the Technician in Precision Optics blueprint is tested. Reveal the answer and explanation under each question.
A technician measures the same lens five times and records 4.512, 4.513, 4.512, 4.513 and 4.512 mm. The certified thickness of the lens is 4.550 mm. This set of measurements is BEST described as:
Correct answer: A - Precise but not accurate
A spherical surface has a radius of curvature of 250 mm and a semi-diameter of 25 mm. Its sagitta is approximately:
Correct answer: B - 1.25 mm
An inspection report lists a polished area of 0.25 in². Converted to square millimeters, this area is:
Correct answer: C - 161.29 mm²
A technician works near an unenclosed 1064 nm Nd:YAG laser. Compared with a visible laser of the same power, this wavelength presents a greater hazard to the eye PRIMARILY because:
Correct answer: A - It is invisible, so the blink reflex offers no protection
A system is certified as a Class 1 laser product because its Class 4 laser is fully enclosed. A technician opens the housing and defeats the interlock to perform an alignment. During this work the system must be treated as:
Correct answer: B - Class 4, matching the embedded laser inside the housing
Hydrofluoric acid is considered uniquely dangerous among the acids used in optical fabrication PRIMARILY because:
Correct answer: D - Skin contact can be painless while injury progresses
An optical glass carries the six-digit code 517642. This indicates a refractive index and Abbe number of approximately:
Correct answer: A - n_d = 1.517 and V_d = 64.2
During fining, each successive step uses a progressively finer abrasive PRIMARILY in order to:
Correct answer: A - Remove the subsurface damage left by the previous step
A drawing specifies a surface quality of 60-40 per MIL-PRF-13830B. The number 60 specifies:
Correct answer: D - A visibility grade, not a physical dimension
In a Fizeau test using a 632.8 nm HeNe source, a surface departs from the reference flat by two fringes. The corresponding surface height error is approximately:
Correct answer: C - 633 nm
The full bank has 1,020 more TPO questions with explanations.
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