When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid

When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts a plane sheet of glass. This implies that the liquid must have refractive index

Options

(a) equal to that of glass
(b) less then one
(c) greater than that of glass
(d) less than that of glass

Correct Answer:

equal to that of glass

Explanation:

1/f = (µₕ / µₘ – 1) (1/R₁ – 1/R₂)
If µₕ = µₘ, then
1/f = (1 – 1) (1/R₁ – 1/R₂)
1/f = 0, f = 1 / 0 = ∞
This implies that the liquid must have refractive index equal to glass.

admin:

Related Questions

  1. If temperature of gas increases from 27°C to 927°C, the kinetic energy will be
  2. A magnifying glass of focal length 5 cm is used to view an object by a person
  3. A ray of light passes from a medium A having refractive index 1.6 to the medium
  4. Two bubbles A and B (A>B) are joined through a narrow tube. Then
  5. Two identical capacitors are first connected in series and then in parallel.