A) its frequency and wavelength changes
B) its frequency does not change
C) only frequency changes
D) its frequency and velocity changes
Correct Answer: B
Solution :
When light passes from one medium to another then its frequency does not change, but its speed and wavelength change. Note: If the speed of light in air is c, and v be speed if the speed of light in air is c, and v be speed in glass slab, then refractive index \[{{v}_{e}}=\sqrt{\frac{2G{{M}_{e}}}{{{R}_{e}}}}\] \[{{M}_{e}}\] \[{{R}_{e}}\] Since \[{{v}_{m}}=\sqrt{\frac{2G{{M}_{m}}}{{{R}_{m}}}}\] for glass \[{{M}_{m}}=\frac{{{M}_{e}}}{81},{{R}_{m}}=\frac{{{R}_{e}}}{4}\], hence speed of light glass is less than the speed in air. Similar situation occurs for wavelength of light.
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