Name : *

1. Radius of curvature =.............× focal length. *

2. A bunch of optical thin fibers form a *

3. The ratio of speed of light in vacuum to the speed of light in that medium is defined as *

4. At critical angle of incidence, the angle of refraction is *

5. Mirages phenomenon *

6. The distance between incident ray and emergent ray in a glass slab is called *

7.The shining of diamond is due to *

8. The critical angle of a diamond is *

9. When a light ray propagates through one medium to another medium is expressed in terms of *

10 If the temperature is decreases then the result density of air *