മരങ്ങളും കെട്ടിടങ്ങളും മറ്റും നിശ്ചലാവസ്ഥയിലാണെന്ന് പറയുമ്പോൾ അവലംബമായെടുക്കുന്നത്:
Aഭൂമിയെ
Bസൂര്യനെ
Cചന്ദ്രനെ
Dനക്ഷത്രങ്ങളെ
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Which of the following statements are correct?
- (a). For a lens the first principal focus is the position of the object whose image is at infinity
- (b) For a lens the first principal focus is the position of the object whose image is formed at twice the focal length.
- (c) For a lens the second principal focus is the position of the real image whose object is at infinity
- (d) For a lens the second principal focus is the position of the object whose image is formed at twice the focal length