A Cassegrain Telescope Has a Primary Mirror with a 5-M

question 262

Multiple Choice

A Cassegrain telescope has a primary mirror with a 5-m diameter and a hole of diameter 5 cm through the primary mirror. By what percent is the light-gathering power of the mirror reduced because of the hole?

• A) 0.01%
• B) 1%
• C) 20%
• D) 50%

---

Definitions:

Directed Content Analysis

A methodology in qualitative research where existing theory or research guides the analysis of textual data.

Existing Theories

Pre-established theoretical frameworks or hypotheses that are used to guide research, explain phenomena, or make predictions.

Themes

Recurring subjects or underlying ideas found within a dataset or narrative, often identified during qualitative analysis.

Research Focus

The central theme, subject, or objective that guides a scholarly or scientific study.