Question

Distance measured vertically upwards from the principal axis are taken as ......... *
Positive
Negative
Zero​

Answer 1

Answer:

POSITIVE

Explanation:

All the distances parallel to the principal axis of the mirror are measured from the pole of the mirror. Distances measured vertically upwards from the principal axis of the mirror are taken as positive. Distances measured vertically downwards from the principal axis of the mirror are taken as negative.

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