The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is
49° to the horizontal
90° with the vertical
49° to the vertical
along the horizontal
C.
sin θ = 1μw = 11.33 ⇒ θ = sin-1 11.33⇒ θ = 49° to the vertical.
The solar spectrum during a complete solar eclipse is
continuous
emission line
dark line
dark band
The rate of emission of a black body at 0°C is R, its rate of emission at 273°C is
4 R
8 R
16 R
32 R
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