It is found that all electromagnetic signals sent from A towards B reach point C . The speed of electromagnetic signals in glass cannot be

Question

It is found that all electromagnetic signals sent from A towards B reach point C . The speed of electromagnetic signals in glass cannot be, 1 .0 × 10 8 m s - 1, 2 .15 × 10 8 m s - 1, 2 × 10 7 m s - 1, 4 × 10 7 m s - 1

MARKS App · Accepted Answer

There TIR at B, i > i C ∴ 45 o > sin - 1 ⁡ 1 μ ∴ 45 o > sin - 1 ⁡ v g c ∴ sin ⁡ 45 ° > v g C ∴ v g c × sin ⁡ 45 ° ∴ v g 3 × 10 8 × 1 2 ∴ v g 2.14 × 10 8 m s - 1

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