282240 Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because
Ans : (d): In total internal reflection, when a ray of light travels from denser to rarer medium, it bends away from the normal because the angle of incidence in denser medium increases. The angle of refraction in rarer medium also increases and at a certain angle, the angle of refraction becomes \(90^{\circ}\). This angle of incidence is called critical angle. When the angle of incidence is greater than the critical angle then the light ray comes back into the same medium after reflection from interface. This phenomenon is known as the total internal reflection
Hence, light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because successive total internal reflections occur as a ray moves through the fibre.
282240 Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because
Ans : (d): In total internal reflection, when a ray of light travels from denser to rarer medium, it bends away from the normal because the angle of incidence in denser medium increases. The angle of refraction in rarer medium also increases and at a certain angle, the angle of refraction becomes \(90^{\circ}\). This angle of incidence is called critical angle. When the angle of incidence is greater than the critical angle then the light ray comes back into the same medium after reflection from interface. This phenomenon is known as the total internal reflection
Hence, light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because successive total internal reflections occur as a ray moves through the fibre.
282240 Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because
Ans : (d): In total internal reflection, when a ray of light travels from denser to rarer medium, it bends away from the normal because the angle of incidence in denser medium increases. The angle of refraction in rarer medium also increases and at a certain angle, the angle of refraction becomes \(90^{\circ}\). This angle of incidence is called critical angle. When the angle of incidence is greater than the critical angle then the light ray comes back into the same medium after reflection from interface. This phenomenon is known as the total internal reflection
Hence, light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because successive total internal reflections occur as a ray moves through the fibre.
282240 Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because
Ans : (d): In total internal reflection, when a ray of light travels from denser to rarer medium, it bends away from the normal because the angle of incidence in denser medium increases. The angle of refraction in rarer medium also increases and at a certain angle, the angle of refraction becomes \(90^{\circ}\). This angle of incidence is called critical angle. When the angle of incidence is greater than the critical angle then the light ray comes back into the same medium after reflection from interface. This phenomenon is known as the total internal reflection
Hence, light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because successive total internal reflections occur as a ray moves through the fibre.