PUZZLE

REFRACTION OF LIGHT 

Across

1. no units
2. splitting of light iin to seven colours
3. reemission of light

Down

1. bending of light except incident on normal
2. light grazes between two media
3. example of total internal refelction
4. n1 sin i= n2 sin r
5. low critical angle
6. works on th principle of TIR

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