Q179
Assertion (A): Small glass beads fixed on traffic signals glow brightly when light falls upon them. Reason (R): Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium.
A.
Both (A) and (R) are true and (R) is the correct explanation of (A)
AnswerB.
Both (A) and (R) are true, but (R) is not the correct explanation of (A)
C.
(A) is true, but (R) is false
D.
(A) is false, but (R) is true
Answer: Option A
Solution
Answer: Option A
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