ലെൻസിന്റെ പവർ അളക്കുന്ന യൂണിറ്റ് :
Aഡയോപ്റ്റർ
Bഫാരഡ്
Cഡസിബെൽ
Dവാട്ട് -
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Power of a lens is 10 D, its focal length is :
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An object. 3.0 cm in height, is placed at a distance of 20.0 cm in front of a convex mirror of focal length 6.0 cm. on its principal axis. Its image has a height of _______and is_____?
______ mirror is used in motor vehicles as rear view mirror.