You have three lenses L1, L2 and L3 of powers +10D, +5D and -10D respectively. *IMPORTANT* a. State the nature and focal length of each lens.

b. Explain which of the three lenses will form a virtual and magnified image of an object

placed at 15 cm from the lens.

c. Draw the ray diagram in support of your answer.

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.