Exams › NEET › Physics

The frequency of a light wave in a material is 2 × 10¹⁴ Hz and wavelength is 5000 Å. The refractive index of material will be

1. 1.50
2. 3.00
3. 1.33
4. 1.40

Correct answer: 1.50

Solution

The speed of light in the material is calculated using v = fλ, where f = 2 × 10¹⁴ Hz and λ = 5000 Å = 5 × 10⁻⁷ m. This gives v = (2 × 10¹⁴)(5 × 10⁻⁷) = 10⁸ m/s. The refractive index is n = c/v, where c = 3 × 10⁸ m/s. Thus, n = (3 × 10⁸) / (10⁸) = 1.5.

Related NEET Physics questions

• An image formed by a plane mirror is:
• One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face forms an image 12 cm behind the silvered face. The refractive index of the glass is
• Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is 3/2 is
• A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5, the wavelength of refracted light will be
• Green light of wavelength 5460 Å is incident on an air-glass interface. If the refractive index of glass is 1.5, the wavelength of light in glass would be (c = 3 × 10⁸ ms⁻¹)
• When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index.

⚔️ Practice NEET Physics free + battle 1v1 →