Question

129. Light of wavelength 5000 Å falls on a plane reflecting
surface. For what angle of incidence is the reflected ray
normal to the incident ray?
(a) 0°
(b) 30°
(c) 90°
(d) 45°
.
plez answer with solution....
❌no copied answer❌.....
NEET class 12th.....​

Answer 1

λ=5000×10 rise to the power -10 m

ν= c/λ =6×10¹⁴ Hz

For the reflected light, λ,ν remains same.

i is the incident angle. r is the reflected angle.

i+r=90⁰

By, law of reflection, i=r

⇒i = r = 45⁰

therefore the ans is option d) 45⁰

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Answer 2

Answer:

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