Q.

Solid angle is the ratio of A plane angle was defined as a ratio of two quantities having same dimension of length. A plane angle was defined as a ratio of two quantities having the same dimension of length. 

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a

dΩ=dAr2

b

dΩ=dAr

c

dΩ=dsr2

d

dΩ=dsr

answer is C.

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Solid angle is the ratio of A plane angle was defined as a ratio of two quantities having same dimension of length. A plane angle was defined as a ratio of two quantities having the same dimension of length.