SATHEE: Optics Question 955

Optics Question 955

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:

Options:

A) $1.0 \times 10^{8} m / s$

B) $2.4 \times 10^{8} m / s$

C) $2 \times 10^{7} m / s$

D) $4 \times 10^{7} m / s$

Show Answer

Answer:

Correct Answer: A

Solution:

[a] This is a case of total internal reflection.

$∴$ $θ > θ_{c} (= \sin^{- 1} \frac{1}{μ})$ $\frac{1}{μ} < \sin θ$

$\frac{1}{μ} < \sin 45^{\circ}$ $μ > 1 / \sin 45^{\circ}$

$μ > \sqrt{2}$ As $v = \frac{c}{μ}$ $v < \frac{c}{\sqrt{2}} = \frac{3 \times 10^{8}}{\sqrt{2}}$ $v < 2.1 \times 10^{8}$

$∴$ only (2) is not possible.

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Optics Question 955

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:

Options:

Answer:

Solution:

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