International A LevelPhysicsEdexcelExam Questions2. Waves & ElectricityRefraction, Reflection & Polarisation

Refraction, Reflection & Polarisation (Edexcel International A Level Physics)

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Refraction, Reflection & Polarisation

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Refraction, Reflection & Polarisation

1
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The diagram shows refraction of a ray of light as it passes through three transparent substances, L, M and N. The speeds of light in the three substances are vL, vM and vN, respectively.

q5-6-wph12-02-jan-2022-edexcel-int-as-a-level-phy

Which of the following shows the relationship between vL, vM and vN?

  • vL > vM > vN

  • vL > vN > vM

  • vN > vM > vL

  • vM > vN > vL

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2
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The diagram shows refraction of a ray of light as it passes through three transparent substances, L, M and N. The speeds of light in the three substances are vL, vM and vN, respectively.

q5-6-wph12-02-jan-2022-edexcel-int-as-a-level-phy

Which of the following could result in a ray of light undergoing total internal reflection?

  • light travelling from L to M

  • light travelling from L to N

  • light travelling from M to L

  • light travelling from N to M

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3
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A light bulb with an efficiency of 12% is positioned 2.0 m above a light sensor.
The intensity of light at the light sensor is 0.14 W m−2.

Which of the following could be used to calculate the power of the light bulb?

  • open parentheses 0.14 close parentheses space cross times open parentheses 0.12 close parentheses space cross times open parentheses 4 straight pi close parentheses cross times open parentheses 2.0 close parentheses squared

  • fraction numerator open parentheses 0.14 close parentheses space cross times open parentheses 4 straight pi close parentheses cross times open parentheses 2.0 close parentheses squared over denominator 0.12 end fraction

  • open parentheses 0.14 close parentheses space cross times open parentheses 0.12 close parentheses space cross times open parentheses straight pi close parentheses cross times open parentheses 2.0 close parentheses squared

  • fraction numerator open parentheses 0.14 close parentheses space cross times open parentheses straight pi close parentheses cross times open parentheses 2.0 close parentheses squared over denominator 0.12 end fraction

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