1)The formation of shadows is a consequence of
A polarization of light
B rectilinear propagation of light
C fraction of light
D reflection of light
2)According to the standard model, the fundamental building blocks of the universe are?
A) atoms
B)strings
C) molecules
D) quarks
3)A convex lens is also called a
A) converging lens
B)focussing lens
C)planaer lens
D)diverging lens