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Tourmaline is a hexagonal crystal. The l...

Tourmaline is a hexagonal crystal. The longest diagonal of the crystal is known as______ [Fill in the blank.]

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Quartz is a _____crystal [fill in the blank].

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The regular three dimensional arrangement of points in a crystal is known as crystal lattice and the smallest repeating pattern in the lattice is called unit cell. The unit cells are characterised by the edge lengths a, b, c and the angles between them alpha, beta and gamma respectively. Based on this, there are seven crystal systems. In a cubic unit cell: a=b=c and alpha = beta=gamma=90^(@) The number of points in simple, body centred and face centred cubic cells are 1,2 and 4 respectively In both the hcp and ccp of spheres, the number of tetrahedral voids per sphere is two while the octahedral voids is one. A double triangular void surrounded by three spheres above and three spheres below is called

The regular three dimensional arrangement of points in a crystal is known as crystal lattice and the smallest repeating pattern in the lattice is called unit cell. The unit cells are characterised by the edge lengths a, b, c and the angles between them alpha, beta and gamma respectively. Based on this, there are seven crystal systems. In a cubic unit cell: a=b=c and alpha = beta=gamma=90^(@) The number of points in simple, body centred and face centred cubic cells are 1,2 and 4 respectively In both the hcp and ccp of spheres, the number of tetrahedral voids per sphere is two while the octahedral voids is one. The C.N of cation occuppying an octahedral vois is:

CHHAYA PUBLICATION-DIFFRACTION AND POLARISATION OF LIGHT-EXERCISE (VERY SHORT ANSWER TYPE QUESTIONS)
  1. Why does ultrasonic wave not exhibit polarisation?

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  2. When light is polarised, how does its intensity change?

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  3. Sunray, sodium light, head light of an automobile- which of these ligh...

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  4. What is the angle of between the plane of polarisation and the directi...

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  5. Tourmaline is a hexagonal crystal. The longest diagonal of the crystal...

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  6. If a beam of light its vibrations restricted to one plane instead of d...

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  7. The plane containing the direction of propagation of light and perpen...

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  8. A ray of light incident on a medium at polarising angle.what will be t...

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  9. If the polarising angle for air-glass interface be 56^(@), what will b...

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  10. What is the relation between polarising angle i(p) and refractive inde...

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  11. For a slab, polarising angle is (pi)/(3) rad. What is the refractive i...

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  12. The angle of polarisation for glass, is about [ Fill in the blank].

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  13. The particular angle of incidence, for which the degree of polarisatio...

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  14. If Brewster's angle be theta, then the magnitude of the critical angle...

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  15. Give an example of a double refracting crystal.

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  16. The ordinary ray i.e., O-ray obeys the general laws of refraction of l...

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  17. In case of negative crystals the velocity of E-ray is than that of O-...

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  18. Quartz is a crystal [fill in the blank].

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  19. If refractive indices of a positive crystal for O-ray and E-ray are mu...

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  20. Use of instead of glass in high quality sunglasses is more pleasant f...

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