Arrange the following materials in increasing order of refractive Index A. Diamond B. Water C. Air D. Vacuum Choose the correct answer from the options given below :
D, B,C, A
The question asks to arrange the given materials in increasing order of refractive index. The refractive index of a material is a measure of how much the speed of light is reduced inside the material compared to vacuum. Let's analyze the refractive indices of the materials provided:
- Vacuum: The refractive index of vacuum is 1, as it is the standard reference with no optical density.
- Air: The refractive index of air is approximately 1.0003, which is very close to 1 because air is not much denser than vacuum.
- Water: Water has a refractive index of about 1.33, as it is denser than air and therefore slows down light more.
- Diamond: Diamond has a refractive index of about 2.42, making it one of the highest for naturally occurring materials. This is due to its dense atomic structure.
Based on the refractive indices, the order from lowest to highest is:
- Vacuum (Refractive Index = 1)
- Air (Refractive Index ≈ 1.0003)
- Water (Refractive Index = 1.33)
- Diamond (Refractive Index = 2.42)
Therefore, the correct order is D, C, B, A. However, please note the options introduced a minor error in their sequence, the correct understanding should align with this factual data. Let's check the given options:
- A, C, B, D - This order is incorrect as it doesn't match the factual sequence of refractive indices.
- D, B, C, A - This order is incorrect. It suggests Water before Air, which is not correct.
- C, D, A, B - This order is incorrect as Air should come before Water.
- B, A, D, C - This order is incorrect as Diamond should come last due to its highest refractive index.
Considering this interpretation issue, check the factual sequence and assess the options available on intuition-based choices.
Similar Questions
If numerical aperture and fractional refractive index of an optical fibre are 0.22 and 0.012, respectively. The refractive index of core (µ1) and cladding (µ2) will be
Which of the following is not a usual classification of optical fibre ?
Assertion (A) : In the propagation of light along multimode graded index fibre, the rays moving toward the cladding travel longer path with greater velocity than the rays travelling shorter path near the axis of fibres. These cause less spreading as compared to spreading caused by multimode step index fibre.
Reason (R) : The velocity varies because refractive index of the multimode graded index fibre increases with radial distance from the centre (axis).
An optical fibre has numerical aperture (NA) of 0.3 and refractive index $\eta_2$ of cladding material is 1.6. What is the refractive index of core material?
Match the following lists :
List – I List – II a. \(\pi a\,NA/\lambda\) i. attenuation factor (dB/km) b. \(10\log_{10}\left(\dfrac{P_{in}}{P_{out}}\right)\) ii. Intermodal time delay c. \(\dfrac{l}{L}\dfrac{dt_g}{d\lambda}\) iii. Dispersion causing pulse spreading d. \(\dfrac{L(n_1-n_2)n_1}{n_2c}\) iv. Number of modes produced by an optical fibre Assertion (A) : Attenuation and dispersion have negative effects on the propagation of signal in the optical fibres.
Reason (R) : Optical signal degradation is caused due to structural imperfections of the fibre material.
Select your answer using the codes given below.
A fiber has a core radius of 6 μm, operating wavelength = 1550 nm. The V-number of the fiber is given by :
In linearly polarized modes traversing in the optical fibers the LP01 is exactly equal to :
The value of Numerical Aperture in case of optical fiber is
The core of an optical fiber has
Important Questions from Optical Fiber
The material used for making optic-fibre cable in general is-
Multimode step-index fiber with a core diameter of 80 μm and a relative index difference of 1.5% is operating at a wavelength of 0.85 μm. If the core refractive index is 1.48, then the normalized frequency for the fiber is
In a multimode fiber (step index), number of modes passing at an operating wavelength of 1300 nm are 1000, the refractive index of the core is 1.50 and that of the cladding is 1.48. The value of core diameter is:
In optical fibers, the Rayleigh scattering is proportional to:
A graded indexed optical fiber has a parabolic refractive index profile (α = 2). If the fiber has a numerical aperture = 0.22 the total number of guided modes at a wavelength of 1310 nm is given by:
