Fill in the blanks1. The velocity of light in vacuum is ………. 2. If v is the frequency and λ is the wavelength then velocity of the wave is c = ………. 3. Among colours of visible light ……… colour has the highest wavelength. 4. According to Snell’s law refractive index, µ2 = ……….5. In a medium having high value of refractive index then speed of light in that medium is ………. 6. Angle of refraction is the smallest for ……… and the highest for ………. 7. The refractive index depends on ………. of light. 8. Colours having shorter wavelength scattered more than longer wavelength colours according to ……….. law. 9. After passing through a convex lens ……….. rays ………. at the principal focus. 10. For a convex lens, as the object distance increases, the image distance ………. 11. A ray passing through the optic centre of a lens emerges …………12. ……… is due to irregular curvature of the surface of the eye lens. 13. When a parallel beam of light passes through a convex lens, the rays from the outer edges are ………… 14. A ray parallel to the principal axis of a convex lens after refraction passes through ………… 15. When the object is placed between ………….. and ………… of a convex lens a virtual image will be formed. 16. For a convex lens, as the object approaches the lens the image becomes …………17. In a phographic camera ………… lens is used. 18. The shorter the focal length, the ………. is the magnification. 19. The nature of the image formed by a simple microscope is ……….., ………… and ………… 20. Real images are formed by a ……….. lens. 21. Concave lens produces ………… images. 22. The value of power of a lens having focal length one metre is ……….. 23. For a normal eye the value of far point is ………… 24. …………. is known as short sightedness. 25. Hyper metropia is known as ……….. 26. The mathematical form of focal length of a concave lens used to correct myopia is f = ………. 27. ……….. lenses are used to correct astigmatism. 28. For a normal eye, the value of least distance of distinct vision is ……….. 29. The objective of the compound microscope has …………. focal length. 30. The focal length of ………. is greater in a compound microscope. 31. ……… is an optical instrument to see the distant objects. 32. A terrestrial telescope produces ……… image.33. Elaborate view of galaxies and planets is obtained by ………