please it is important classwork if you keep irrelevant i report your question
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1) m=c/v
=3×108/2×10
=1.5×107 ans
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okay answer 1. Option B . because air is the rarer medium and glass is the denser medium
answer 2.option C is the answer angle i=angle r this is then when light ray is normal to the surface
answer 3.option C because volume of rarer medium is more
answer 4. option C in both
answer 5. option B speed of light changes .
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