Across
- 3. When slow vibration direction of accessory plate matches with that of a mineral, the retardations
- 5. Biotite and muscovite have ____ extinction
- 7. Produced when the retardation is an integral number of the wavelength
- 9. c axis coincides optic axis
- 10. Alpha / beta / gamma correspond b axis
- 13. When birefringence is high, the corresponding retardation is
- 14. The direction of movement of light
- 17. The indicatrix has same radius in all directions of indicatrix
- 18. Three crystallographic axes correspond principal optic axes
- 19. Change of colour of mineral on rotation of stage is ______
Down
- 1. Basal sections of amphiboles have _____ extinction
- 2. The color produced due to a light ray being split into two rays
- 4. The phenomenon of formation of two images of one object is
- 6. Order of retardation is directly proportional to
- 8. There is one major and a minor axis corresponding principal refractive indices in the indicatrix
- 11. Length fast is called ______ elongation
- 12. section The principal section of biaxial minerals that contains both the optic axes
- 15. Extinction angle is indeterminate for ________ minerals with no cleavage
- 16. When refractive index of extraordinary ray is more than that of ordinary ray, it is optically
- 20. For transmitted light microscopy it is related to Refractive index