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A ray of light incident on an equilateral prism shows minimum deviation of 30 $^{\circ}$ . The speed of light through the glass prism is :
$2.5 \times 10^{8}$ m/s
$2.121 \times 10^{8}$ m/s
$3 \times 10^{8}$ m/s
$3.2 \times 10^{8}$ m/s

A

3.2 \times 10^{8}

m/s

B

2.121 \times 10^{8}

m/s

C

3 \times 10^{8}

m/s

D

2.5 \times 10^{8}

m/s

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