Physics-Objective Related Question Answers
251. Which mirror is used as Rearview mirror in automobiles?
Convex mirror
252. A transparent medium bounded by two surfaces atleast one of which is curved surface is called?
Lens
253. The lens thicker at the middle than in edges is called?
Convex Lens
254. The lens thicker at edges than in the middle?
Concave lens
255. The unit of power of lens?
Dioptre
256. Power and focal length of convex lens?
Positive
257. The power and focal length of concave lens?
Negative
258. Lens in human eye?
Convex lens
259. Image formed in concave lens?
Virtual and erect
260. Converging lens is an alternative name of?
convex lens
261. Diverging lens is an alternative name of?
concave lens
262. An alternative name of Converging mirror is?
concave mirror
263. An alternative name of Diverging mirror is?
convex
264. Image formed in Convex lens?
Real and inverted
265. The shortest distance for clear vision is?
25cm
266. Twenty - Twenty vision means?
Perfect vision mirror
267. Myopia/Short sightedness can be corrected by using?
concave lens
268. Hypermetropia /Iong sightedness Can be corrected by using?
convex lens
269. Both Myopia and hypermetropia can be corrected using?
bifocal lenses
270. Astigmatism can be corrected by using?
cylindrical lens
271. Presbyopia can be corrected by?
convex lenses
272. Persistence of vision of human eye?
1/16 seconds
273. Full form of LASER is?
Light Amplification by Stimulated Emission of Radiation
274. LASER was discovered by?
Theodore Maiman (1960)
275. Full form of MASER is?
Microwave Amplification by Stimulated Emission of Radiation
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