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281. Theminimumdistancebetweenanobjectanditsrealimageinaconvexlensis_____________?

A.2f
B.2.5f
C.3f
D.4f

282. Dioptrepowerofanconcavelensof1cmfocallengthis_______________?

A.1dioptre
B.1dioptre
C.1/1dioptre
D.1/1dioptre

283. Apointwheretheincidentparallelraysoflightconvergeorappeartodivergeafterpassingthroughalensiscalled______________?

A.centerofcurvature
B.focus
C.opticalcenter
D.aperture

284. Thevalueofcriticalangleforglassis_______________?

A.42°
B.47°
C.52°
D.5°

285. Inopticfibertransmissionsystem_____________areusedregeneratethedimlightsignal?

A.Diodes
B.Repeaters
C.Laser
D.Transformer

286. Magnificationoftheastronomicaltelescopeis_____________?

A.fo+fe
B.fo/fe
C.fe/fo
D.(1+fo/fe)L/fo

287. Errorsinthetransmissionofpowerthroughopticfibercanbeminimizedbyusinga______________?

A.Multimodeindexfiber
B.Gradedindexfiber
C.Singlemodestepindexfiber
D.Copperwire

288. Thefunctionofcollimeterinspectrometeris________________?

A.toproduceparallelbeamsoflight
B.tofilterthelightrays
C.tomakethem
D.nofunction

289. Inopticfibertransmissiontherepeaterareseparatedthroughadistanceof__________kminnewersystem?

A.3km
B.2km
C.1km
D.2km

290. Michelsondevisedtheformulatocalculatethespeedoflight_______________?

A.C=4fd
B.C=8fd
C.C=16fd
D.C=5/2fd