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This is too hard for me.
Can anyone tell me what lesson this is
jpjayesh1999:
Refractive index = speed of light in vacuum/ speed of light in medium
hence,
1.5 = 3 * 10^ 8/ x x= 2* 10^8
percentage change = [(3 - 2) * 10^8/ 3*10^8] * 100 = 33.33%
ok
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