Question

The wavelength of a beam of light in air is 3750 &.Find the number of waves of the beam in 10cm of glass.Also find the time required by the beam to pass through 10cm of glass of refractive index 1.5.

Answer 1

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Wavelength of a beam of light =400 cm-1; 'v = 400 cm-1

v =1 /λ

λ = 1/v = 1/400 cm = 2.5 x 10-3 cm

= 2.5 x 104 nm.

Calculation of frequency

c = vλ

v = c /λ = cv = 3 x 1010 cm s-1 x 400 cm-1

= 1.2 x 1013 s-1

Answer 2

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