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Why Does a Diamond Shine More than a Glass Piece Cut to the Same Shape? - Physics

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प्रश्न

Why does a diamond shine more than a glass piece cut to the same shape?

टीपा लिहा

उत्तर

A diamond shines more because of the phenomenon of total internal reflection (TIR). The refractive index of diamond is ≈2.4 and that of glass is ≈1.5.
By using the relation

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पाठ 18: Geometrical Optics - Short Answers [पृष्ठ ४१०]

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एचसी वर्मा Concepts of Physics Vol. 1 [English] Class 11 and 12
पाठ 18 Geometrical Optics
Short Answers | Q 3 | पृष्ठ ४१०

संबंधित प्रश्‍न

  1. Figure shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure?
  2. What is the answer if there is no outer covering of the pipe?

Light incident normally on a plane mirror attached to a galvanometer coil retraces backward as shown in Figure. A current in the coil produces a deflection of 3.5° of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?


The refractive index of a material changes by 0.014 as the colour of the light changes from red to violet. A rectangular slab of height 2.00 cm made of this material is placed on a newspaper. When viewed normally in yellow light, the letters appear 1.32 cm below the top surface of the slab. Calculate the dispersive power of the material.


A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of 45°. The ray can undergo total internal reflection for the following n.


What is angle of deviation due to refraction?


Why do stars twinkle?


Explain the reason for glittering of diamond.


Write a short note on the prisms making use of total internal reflection.


What is Snell’s window?


Obtain the equation for lateral displacement of light passing through a glass slab.


The critical angle for a ray of light from glass to air is 'θ' and refractive index of glass with respect to air is 'n'. If a ray of light is incident from air to glass at an angle 'θ', then corresponding angle of refraction is ______.


When a light ray is incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of material of prism is `sqrt2`, then angle of prism will be ______.

`sin  pi/4=1/sqrt2, sin30^circ=cos60^circ=1/2`


The critical angle is maximum when light travels from ______.

`(a^mu"w"=4/3,a^mug=3/2)`


When a ray of light is incident normally on one refracting surface of an equilateral prism of refractive index 1.5, the emerging ray ______.

`[sin^-1(1/1.5)=41.8^circ]`


Light travels from an optically denser medium 'A' into the optically rarer medium 'B' with speeds 1.8 × 108 m/s and 2.7 × 108 m/s respectively. Then critical angle between them is ______.

1 and µ2 are the refractive indices of media A and B respectively.)


Light travels in two media A and B with speeds 1.8 × 108 ms−1 and 2.4 × 108 ms−1 respectively. Then the critical angle between them is:


A ray of unpolarised light is incident on the surface of glass plate of µ = 1.54 at polarising angle, then angle of refraction is


Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because ______.

  1. the apparent depth of the points close to the edge are nearer the surface of the water compared to the points away from the edge.
  2. the angle subtended by the image of the object at the eye is smaller than the actual angle subtended by the object in air.
  3. some of the points of the object far away from the edge may not be visible because of total internal reflection.
  4. water in a trough acts as a lens and magnifies the object.

Show that for a material with refractive index `µ ≥ sqrt(2)`, light incident at any angle shall be guided along a length perpendicular to the incident face.


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