X PHYSICS
UNIT – VII
LIGHT-NATURE OF LIGHT & SOURCES OF LIGHT
1. Newton proposed ____________ theory of light.
2. Corpuscles are ____________ by the reflecting surface.
3. Corpuscles are ____________ by the refracting surface.
4. Wave theory of light was proposed by ____________.
5. Corpuscular theory could not explain ____________,____________,____________.
6. Light rays can be produced from ____________ body.
7. Examples of luminous bodies are ____________.
8. In quantum theory of radiation, light is treated as consisting of ____________.
9. Light consists of radiations called ____________.
10. The basis of Huygen’s wave theory of light is ____________.
11. According to Huygen’s theory light travels in the form of ____________.
12. Newton’s theory of light failed to explain ____________.
13. Light waves are ____________ in nature.
14. In a ripple tank the crest behaves as ____________ lens.
15. For destructive superposition of waves phase difference is ____________.
16. Corpuscular theory of light was proposed by ____________.
17. Speed of light in vacuum is ____________.
18. According to wave theory of light, sodium lamp sends out light in the form of ___________.
19. The radiant energy is called ____________.
20. Unit for luminous flux is ____________.
21. Unit of brightness ____________.
22. Sun light has its maximum radiant energy close to ____________.
23. The luminosity value of halogen lamp is ____________.
24. First laser was called ____________.
25. The band width for a high quality laser of light is called ____________.
26. ____________ are used for bloodless surgery.
27. Lasers are used to study the nature of ____________ state of matter.
28. Laser emits light only in one direction. This is called ____________ of laser light.
29. Ruby laser is an example for ____________.
30. The process of achieving “population inversion” is called ____________.
X PHYSICS
UNIT – VII
LIGHT-NATURE OF LIGHT & SOURCES OF LIGHT (Key)
(1) Corpuscles (2) repelled (3) attracted (4) Huygens (5)Interference, Polarisation, Diffraction (6) luminous (7) Sun, stars (8) quanta (9) photons (10) construction of wave fronts (11) waves (12) incidence (13) transverse (14) Convex (15) ? or ?n (16) Newton (17) 3 × 108 m/sec (18) Cylindrical wave fronts (19)Light (20) Lumen (21) candela/m2 (22) green light (23) 58 lumen/watt (24) pulsed laser (25) high monochromacity (26) Lasers (27) plasma (28) Directionality (29) solid laser (30) pumping.
