Q. The normal line in reflection and refraction is

परावर्तन एवं अपवर्तन में सामान्य रेखा होती है

A
Parallel to mirror
दर्पण के समानांतर
B
Perpendicular to mirror
दर्पण के लंबवत
C
At an angle to mirror
दर्पण के कोण पर
D
Imaginary line
काल्पनिक रेखा

Explanation

The normal is an imaginary line perpendicular to the surface at the point of incidence, used as a reference to measure angles of incidence and reflection/refraction.

अभिलम्ब आपतन बिंदु पर सतह के लंबवत एक काल्पनिक रेखा है, जिसका उपयोग आपतन कोण और परावर्तन/अपवर्तन को मापने के लिए संदर्भ के रूप में किया जाता है।

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