11- The focal length of a C
lens is 10cm.
a) Draw a diagram (scale 1/
ngth of a converging
a diagram (scale 1/2) showing the
al center O and the foci F and F of
Two
rays
falling on
b) Given:
the lens.
the
converging lens come out of a very far
point A on the optical axis so that these
rays are parallel to each other and
parallel to the optical axis. Construct the
path of these rays through the lens and
deduce the position of the image A of A'
given by the lens.

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)