আলোর প্রতিসরণ ও প্রতিফলন

The angle of incidence of a ray for which the angle of refraction is 9090^{\circ} is called

হানি নাটস

The angle of incidence of a ray for which the angle of refraction is 9090^{\circ} is called critical angle.

When the angle of incidence of a ray is greater than the critical angle, the refracted ray is in the same medium, i.e., the light is totally reflected in the same medium. This is known as total internal reflection.

আলোর প্রতিসরণ ও প্রতিফলন টপিকের ওপরে পরীক্ষা দাও