The angle which the periphery of the spherical mirror subtends at the center of curvature is called

1. angular aperture

2. glancing angle

3. Critical angle

4. None of these

The correct option is A

angular aperture

Correct Answer- A

The angle at which the periphery of the spherical mirror subtends at the center of curvature is called the angular aperture.

Incorrect answers

B- The glancing angle is the angle formed by the incident ray on a planar surface and the surface itself.

A beam of electrons striking the crystal is an example of a glancing angle.

B- The critical angle is the angle of incidence that produces a 90-degree angle of refraction.

So, the correct answer is (A) angular aperture.