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. In a pure capacitive A.C circuit, current and voltage differ in phase by
  2. For a parallel beam of monochromatic light of wavelength λ diffraction is produced
  3. The ratio of the radii or gyration of a circular disc to that of a circular ring
  4. The electric potential at a point in free space due to a charge Q coulomb is Q x 10¹¹ v
  5. A step-up transformer operates on a 230 V line and supplies a current of 2 A.