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 reflec

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Q: 105 (IAS/2000)

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.
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,37,18,37,10,8,0

keywords: 

{'traffic signals': [0, 1, 0, 0], 'light': [16, 4, 34, 62], 'small glass beads': [0, 1, 0, 0], 'denser medium': [0, 1, 0, 3], 'incidence': [1, 1, 3, 3], 'angle': [0, 0, 1, 0]}