Power of a lens is 10 D, its focal length is :
A1 cm
B0.1m
C0.01m
D10m
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Related Questions:
______ mirror is used in motor vehicles as rear view mirror.
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വാഹനങ്ങളിൽ പിൻകാഴ്ച കണ്ണാടിയായി സാധാരണയായി ഉപയോഗിക്കുന്നത് ഏത് കണ്ണാടിയാണ് ?