Power of a concave lens is - 12.5 D. What is the focal length of the lens?
in lenses of power + 4.5 D and -SD are placed in contact with each other.
power of the combination, (ii) focal length of the combination.
(ii) 2 m]
ver of a thin convex lens is +3.5 D. It is placed in contact with another
ch that the combined power is + 1.0 D. Calculate: i) power of second
focal length of the second lens.
0.4 m/
power and focal length of a combination of convex lens of loca
d concave lens of focal length 10cm.
161)
f focal length 40 cm is placed in contact with concave lens of
Calculate (i) power of the combination (ii) focal length of the

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?