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When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height 7 cm. If refractive index of glass is 1.5 then refractive index of water is

Options

  1. A1.258
  2. B1.269
  3. C1.286
  4. D1.310

Correct answer

C. 1.286

Step-by-step solution

No. of waves in glass slab = No. of waves in water column ∴ μ g . h g = μ w . h w ∴ μ w = μ g . h g h w = 1.5 × 6 7 ∴ μ w = 9 7 = 1.286

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