تسجيل الدخول

تسجيل

Effect of Total Reflection

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-460

2025-12-18

667

If a luminous point is placed at the bottom of a vessel of water (Fig. 1), it will send rays of light in all directions. All the rays that are within a cone, having its apex at the luminous point and its base in the surface of the water, including an angle of 97°, will pass out into the air. All rays outside of this cone will be reflected from the surface back into the water. This means that the entire space above the water would be seen by an eye looking upward from beneath the surface, within a circle limited by a cone of rays, the angle between any two rays on opposite sides of the cone being 97°. Beyond that circle, the surface of the water acting as a total reflector would reflect the bottom and things lying upon it.