Question

plz answer plz plz.it is urgent

Answer 1

(i) a dimensionlees , unit less physical quantity is REFRACTIVE INDEX , it is simply the ratio of speed of light in vacuum to that in medium.... so neither have units nor have dimensions
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(ii) dimensionlees physical quantity with unit is SOLID ANGLE or PLANE ANGLE..... these are angles i.e. ratios of length
so... only have units no dimensions...
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(iii) 2 physical quantity with same dimensions are TORQUE ,ENERGY, WORK DONE= [M^1L^2T^-2]
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HOPE IT HELPS YOU...
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