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    				| 1. | If light travels a distance x in t₁ seconds in air and 5x distance in t2 seconds in a medium, then the refractive index of medium is | 
| Answer» In AIR, velocity of light( v1) = displacement/ time taken= x/ t1In the unknown medium, velocity of light( V2)= 5x/ t2Now, we know that v is INVERSELY proportional to refractive index( R). Also, note that refractive index of air( r1)= 1.Let the required refractive index be R2.Therefore, v1/v2= r2/r1Or x/t1 *t2/5x= r2/ r1Or t2/ 5t1= r2/1Or r2= t2/5t1 | |