Answer:
a basis or standard for evaluation,assessment or comparison
Explanation:
a point use to find or describe the location of something.
Answer:
An image can be seen in the mirror because the light reflected from an object falls on the mirror and it is reflected.
Answer:
Explanation:
International Bureau of Weights and Measures (BIPM), French Bureau International des Poids et Mesures, international organization founded to bring about the unification of measurement systems, to establish and preserve fundamental international standards and prototypes, to verify national standards, and to determine standard units.