1 Which particles move faster than light - tachyons
2 Which phenomena makes the star twinkle – refraction
3 In which unit the power of lens is expressed – dioptre
4 Which mirror will you recommend for seeing one’s face - concave mirror
5 the phenomenon behind the transmission of light through optical fibre cables is known as – multiple total internal reflection
6 Which phenomenon helps the glowworm to emit light during night – bioluminescence
7 What is the main cause of brilliance of diamond - total internal reflection
8 Rainbow is formed due to - - dispersion and total internal reflection of light
9 Atraveller can see mirage in desert .what is the cause of the mirage in desert - refraction
10 The natural lens in human eyes is --- convex lens
