In optical fibers, light travels by:
AReflection from outer surface
BRefraction only
CDiffraction
DRepeated total internal reflection at core-cladding boundary
Answer & Solution
Correct answer: D. Repeated total internal reflection at core-cladding boundary
Optical fiber: core (higher n) surrounded by cladding (lower n). Light incident at angle > critical angle undergoes TIR at boundary, travels along fiber with very little loss. Cable laid across oceans for telecom.
Related questions
A thin prism of refracting angle 5° is made of glass with n = 1.5. The deviation δ of a liRefraction at a single convex spherical surface: an object in air (n₁ = 1) at distance 20 A converging lens of focal length f is split along its principal axis into two semicirculaA compound microscope has an objective of focal length 1.0 cm and an eyepiece of focal lenGlass has refractive index 1.5 with respect to air. A light ray inside the glass strikes tThe apparent depth of an object lying at the bottom of a pool of water (n = 4/3) is, in teAn object is placed 15 cm from a convex lens of focal length 10 cm. The image isAn object is placed 30 cm from a concave mirror of focal length 20 cm. The image distance