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  4. The dimensional formula of light year is:

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Q. The dimensional formula of light year is:

Rajasthan PMTRajasthan PMT 2005Physical World, Units and Measurements

Solution:

As we know that the light year is the distance which is measured in metre. It is distance travelled by light in one year.
$=3 \times 10^{8} \times 365 \times 24 \times 60 \times 60$
$=9.5 \times 10^{15} m$
Hence, the dimension of light year is $L$