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KVPY2019PhysicsRay Optics

Frosted glass is widely used for translucent windows. The region, where a transparent adhesive tape is stuck over the frosted glass becomes transparent. The most reasonable explanation for this is

Options

  1. Adiffusion of adhesive glue into glass
  2. Bchemical reaction at adhesive tape-glass interface
  3. Crefractive index of adhesive glue is close to that of glass
  4. Dadhesive tape is more transparent than glass

Correct answer

C. refractive index of adhesive glue is close to that of glass

Step-by-step solution

Frosted glass has a rough layer which causes irregular refraction and makes glass translucent. When a transparent tape which has refractive index close to that of glass is pasted over the rough surface of glass, the tape glue fills the roughness of glass. This makes glass surface more smooth and so refraction is more regular. This makes region of tape transparent.

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