Physics-Objective Related Question Answers
201. Early sunrise and late sunset is due to?
Refraction of light
202. Mirage is due to?
Refraction of light
203. Due to change of medium the phase velocity of the wave is changed but its frequency remains?
Constant
204. Fatamorgana is a term associated with?
Mirage
205. The measure of optical density of the medium is?
Refractive index
206. Refractive index of a medium is calculated by?
Speed of light in vacuum/Speed of light in medium$
207. Refractive index of water is?
1.33
208. Refractive index of vacuum is?
1
209. Refractive index of ice is?
1.31
210. Refractive index of diamond is?
2.42
211. The complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle is called Total Internal?
Reflection
212. The father of fibre optics?
Narendra Singh Kapani
213. Sparkling of diamond is due to?
Total Internal Reflection of light
214. Working principle of optical fibres is?
Total Internal Reflection
215. Glittering of water bubbles is due to?
Total Internal Reflection
216. The splitting up of light ray into different colours is called?
Dispersion
217. Dispersion was discovered by?
Sir Isaac Newton
218. Rainbow is formed due to?
Reflection; Refraction and Dispersion of light
219. Main principle due to the formation of rainbow?
Dispersion
220. Rainbow is seen as circle from?
Space
221. Rainbow is seen as semi-circle from?
Earth
222. Rainbow appears in the opposite direction of?
Light
223. Red colour angle in rainbow?
42.8°
224. Violet colour angle in rainbow?
40.8°
225. Colour at top of a rainbow is?
Red
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