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Q.

A beam of light travelling towards a polished surface is called


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a

Normal

b

Reflected ray

c

Incident ray

d

None of these 

answer is C.

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Detailed Solution

A beam of light travelling towards a polished surface is called an incident ray.
The incident ray is the light which falls on the mirror or any polished surface (reflecting surface).
The angle when a ray of light falling on a surface or interface makes with the normal drawn at the point of incidence is called the angle of incidence.
The second law of reflection, which is also the law of incident, states that ‘the incident ray, the normal to the surface at the point of incidence and the reflected ray, all lie in the same plane.'
 
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