The rate of change of parallax dp / dh with respect to change in h , m – McqOptions

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1.	The rate of change of parallax dp / dh with respect to change in h , may be expressed as
A.	fB /( H - h )
B.	fB /( H - h ) 2
C.	fB /( H + h )
D.	fB /( H + h ) 2 .
Answer» C. fB /( H + h )

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