in the given , figure two mirrors P and Q are situated at an angle of 60° with each other and a ray of light is incident on mirror P at an angle of 55 degrees .What is the value of angle A if they again reflected by the mirror Q?
a)35°
b)55°
c)50°
dv)70°
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Answered by
4
Answer:
(c) 50°
Explanation:
A = 50°
choose answer (c) 50°
Answered by
2
Answer:
A ray of light incident on mirror P
at an angle = 55
o
∴∠i=90−55
o
=35
o
∴∠r=∠i=35
o
Hence ∠B=180
o
−(55
o
+35
o
+35
o
)
=180
o
−125
o
=55
o
∴∠C=180
o
−(60
o
+55
o
)=180
o
−115
o
=65
o
= ∴∠A=2[90
o
−65
o
]=2[25
o
]=50
o
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