In Fig. the circular cross-section of tunnel is shown. A 100 W almp is lighted at the heighest point S. The diameter of the tunnel is 2m. Compare the

In Fig. the circular cross-section of tunnel is shown. A 100 W almp is lighted at the heighest point S. The diameter of the tunnel is 2m. Compare the
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In Fig. the circular cross-section of tunnel is shown. A 100 W almp is lighted at the heighest point ... lowest point P and the point Q of the tunnel.
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