a.

Diffraction

b.

Polarization

c.

Interference

d.

Reflection

a.

Positive charge means deficit electrons

b.

Negative charge means excess of electrons

c.

Electric current means movement of electrons

d.

All of the above

a.

119

b.

330

c.

165

d.

146

a.

Refraction of light

b.

Reflection of light

c.

Defraction of light

d.

Rectilinear propagation of light