Question

The distance measured in the direction of the incident light are always taken as​

Answer 1

Answer:

negative

Explanation:

The distance measured in the direction of the incident light are always taken as negative

Answer 2

Answer:

negative

Explanation:

the distance are measured from the poles.

here pole is the origin

the distance measured to the right of the pole along the principal axis are taken as positive

similarly to the left is negative only.

since the incident light is taken only from the left to right,the distance is only negative

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