Question

Relation between angle of incidence and critical angle intotal internal reflection

Answer 1

Answer:

The critical angle is the angle of incidence of a light ray which travels from high optical dense medium to the lower one which results in it being refracted at 90 degree to the normal . When the angle of refraction in the least optical dense medium ( the air ) is 90 degree ( the refracted ray is tangent to the interface ) the angle of the incidence in the most optical dense medium ( the water ) is called the critical angle of this medium ( which differs from one medium to another ) .

The angle of incidence is the angle between the incident light ray and the normal at the point of incidence on the interface , while the angle of refraction is the angle between the refracted light ray and the normal at the point of incidence on the interface .

Explanation:

Answer 2

CRITICAL ANGLE -WHEN A RAY OF LIGHT PASSES FROM A MEDIUM OF HIGHER OPTICAL DENSITY TO A MEDIUM OF LOWER OPTICAL DENSITY ,THE ANGLE OF INCIDENCE AT WHICH THE ANGLE OF REFRACTION BECOMES 90° IS THE CRITICAL ANGLE.

TOTAL INTERNAL REFLECTION-WHEN A RAY OF LIGHT PASSES FROM A MEDIUM OF HIGHER OPTICAL DENSITY TO A MEDIUM OF LOWER OPTICAL DENSITY AT AN ANGLE OF INCIDENCE GREATER THAN THE CRITICAL ANGLE,THE RAY IS REFLECTED BACK TO THE SAME MEDIUM WITH OUT UNDERGOING REFRACTION.THIS KNOWN AS TOTAL INTERNAL REFLECTION.