The first part of the crown glass code 523-589 indicates the refractive index. Which value represents that part?

Study for the NBEO Physiological Optics Test. Prepare with flashcards and multiple-choice questions, each question has hints and explanations. Ace your exam!

Multiple Choice

The first part of the crown glass code 523-589 indicates the refractive index. Which value represents that part?

Explanation:
The first part of the crown glass code represents the refractive index at the sodium D line (589.3 nm). This value is encoded as a three-digit number by multiplying n_d by 1000, so 1.523 becomes 523. Therefore the correct value for the refractive index part is n = 1.523. The second part after the hyphen (589) relates to the Abbe number (dispersion), which would be about 58.9.

The first part of the crown glass code represents the refractive index at the sodium D line (589.3 nm). This value is encoded as a three-digit number by multiplying n_d by 1000, so 1.523 becomes 523. Therefore the correct value for the refractive index part is n = 1.523. The second part after the hyphen (589) relates to the Abbe number (dispersion), which would be about 58.9.

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