Science, asked by priya438, 1 year ago

what is the angle of incidence of a ray if the reflected ray is at angle 80° to the incident ray

Answers

Answered by Ramlayaksingh3

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$<body bgcolor="yellow">Since , angle of incidence = angle of reflection i.e. i=r Angle bw them is 80°. i.e. i+r= 80° Or 2i=2r= 80° i=r=40°</body bgcolor>$

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Answered by abhi569

Given,

The reflected ray is at 80° to the incident ray.

So, ∠i + ∠e = 80

We know that the normal divides both the angles ( ∠i and ∠e ) equally, it means angle of incidence = angle of reflection( ∠i = ∠e ).

Now, ∠i +∠e = 80°

⇒ ∠i + ∠i = 80° ( ∵ ∠e = ∠i )

⇒ 2∠i = 80°

⇒ ∠i = 80° / 2

⇒ ∠i = 40°

∴The angle of incidence is 40°.

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