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3.2 Light

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Question 40

A ray of light travels from water into a block of glass. The relative refractive index of glass with respect to water is nnn.

In waterIn glass
Speed of rayvwv_{\text{w}}vw​vgv_{\text{g}}vg​
Wavelength of rayλw\lambda_{\text{w}}λw​λg\lambda_{\text{g}}λg​
Frequency of rayfwf_{\text{w}}fw​fgf_{\text{g}}fg​

Three suggestions as to how the relative refractive index n n\,n may be calculated are listed:

  1. n=vwvg\displaystyle n = \frac{v_{\text{w}}}{v_{\text{g}}}n=vg​vw​​

  2. n=λwλg\displaystyle n = \frac{\lambda_{\text{w}}}{\lambda_{\text{g}}}n=λg​λw​​

  3. n=fwfg\displaystyle n = \frac{f_{\text{w}}}{f_{\text{g}}}n=fg​fw​​

Which suggestions are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Markscheme

3.2 Light Questions

  1. IGCSE
  2. /Physics
  3. /3.2 Light

216 exam-style questions on CIE IGCSE Physics 3.2 Light, covering 3.2.1a Reflection of light, 3.2.1b Images in a plane mirror, 3.2.2 Refraction of light, 3.2.2a Refraction of light, 3.2.2b Total internal reflection, 3.2.2c Refractive index and critical angle, 3.2.2d Optical fibres, 3.2.3a Converging and diverging lenses, 3.2.3b Ray diagrams and the nature of images, 3.2.3c Virtual images and the magnifying glass, 3.2.3d Correcting long-sightedness and short-sightedness, and 3.2.4 Dispersion of light. Each one has a worked solution and a mark scheme showing where the marks go.

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