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power 4d   calo4d Power of lens =−4D Focal length =1P=1−4=−25cm Negative value of focal length and power indicates that the lens is concave lens Was this answer helpful?

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data sahabat hk 4d The power of a lens is +4D Find the focal length of this lens An object is placed at a distance of 50 cm from the optical centre of this 1-Piece Radiator Grille & Fr Bumper Opening Cover · 110-Volt AC Power Outlet · 150 Amps Alternator · Rear Axle Ratio · 4-Wheel Disc Brakes · 7