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231. Theleastdistanceofdistinctvisionforanormaleyeis_______________?
A.15cm
B.25cm
C.3cm
D.4cm
232. Ifaconvexlensoflargeaperturefailstoconvergethelightraysincidentonittoasinglepoint,itissaidtosufferfrom______________?
A.chromaticaberration
B.sphericalaberration
C.bothsphericalandchromatic
D.distortion
233.Aconvexlensoffocallengthf1andaconcavelensoffocallengthf2areplacedincontact.Thefocallengthofthecombinationis_____________?
A.f2+f1
B.f2–f1
C.f1f2/f2+f1
D.f1f2/f1-f2
234. Inmultimodestepindexfibretherefractiveindexofcoreandcladdingis____________?
A.same
B.different
C.zero
D.differentwithrefractiveindexofcorehigherthancladding
235. Finalimageproducedbyacompoundmicroscopeis_____________?
A.realandinverted
B.realanderect
C.virtualanderect
D.virtualandinverted
236. Fornormaladjustment,lengthofastronomicaltelescopeis______________?
A.fo+fe
B.fo–fe
C.fo/fe
D.fe/fo
237. Twoconvexlensesofequalfocallengthfareplacedincontacttheresultantfocallengthofthecombinationis______________?
A.zero
B.focus
C.2f
D.f/2
238. Leastdistanceofdistinctvision_____________?
A.increaseswithincreaseinage
B.decreaseswithincreaseinage
C.neitherincreasesnordecreases
D.becomesinfiniteafter6years
239. Imageofanobject5mmhighisonly1cmhigh.Magnificationproducedbylensis__________________?
A..5
B..2
C.1
D.2
240. Aconvexlensgivesavirtualimageonlywhentheobjectslies_________________?
A.betweenprincipalfocusandcenterofcurvature
B.beyond2f
C.attheprincipalfocus
D.betweenprincipalfocusandopticalcenter