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If one half of the convexlens is covered by black paper than image formed or not which lie imfront of part of lens which is not covered by black paper?the

velocity of light is 3,00,000km\sec and in the velocityof light is 1,24,000 km\sec then find the refractive index of diamond
he question isn't proper
I think


Didn't quite understand the first question but the answer to your second part is that you have to divide the velocity of light(c) by the velocity of light in the medium(v) which in this case is the diamond. So the answer should be around 2.42
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