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A grating which would be most suitable for constructing a spectrometer for the visible and ultraviolet region should have \[1000000\text{ }lines\text{ }c{{m}^{-1}}.\] Directions : The following 5 (.five) items consists of two statements, one labelled the 'Assertion  'and the other labelled the 'Reason R'. You are  to examine these two statements carefully and decide if the Assertion A and the Reason R are individually true and of so, whether the reason is correct explanation of the Assertion. Select your answer to these items using the codes given below and mark your answer sheet accordingly. Codes:  Both A and R are true and R is the correct explanation of A.  Both A and R are true and R is NOT a correct explanation of A.  A is true but R is false.  A is false but R is true. Assertion  : The angular momentum under a central force is constant. Reason (R): Inverse square law of force is conservative.

A) Both A and R are true and R is the correct explanation of A.

B)  Both A and R are true and R is NOT a correct explanation of A.

C)  A is true but R is false.

D)  A is false but R is true.