what will be the focal length of the lens combination when a lens of power 5D is kept in contact with a lens of power-2D ??
(a) 45 cm
(b) 33.3 cm
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5D-2D=3D
1/f=power
f=1/power
=100/3
=33.3 cm
1/f=power
f=1/power
=100/3
=33.3 cm
lorenekta1:
tq madhu
wlcm
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