Multiple choice

Which of the following is called pole?

  1. The centre of a spherical mirror

  2. The centre of a hollow sphere of glass of which the spherical mirror is a part

  3. The portion of a mirror from which the reflection of light actually takes place

  4. The point on the principal axis where all the rays coming from infinity (parallel rays) after reflection either meet or appear to meet
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A Correct answer
Explanation

The pole is defined as the geometric center of the reflecting surface of a spherical mirror, located on the principal axis.

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