Physics – Human Eye and Light

1. What is the value of the refractive index of water?

  1. 1.00
  2. 1.33
  3. 1.50
  4. 2.00
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Answer: Option B. 1.33

2. Which of the following equations represents the mirror formula?

  1. 1/f = 1/v + 1/u
  2. 1/f = 1/v – 1/u
  3. f = 1/v + 1/u
  4. 1/f = v + u
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Answer: Option A. 1/f = 1/v + 1/u

3. What happens when light travels from a denser medium to a rarer medium?

  1. It bends towards the normal
  2. It does not change direction
  3. It gets absorbed completely
  4. It bends away from the normal
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Answer: Option D. It bends away from the normal

4. Which of the following equations is known as Snell’s law?

  1. sine of the angle of incidence/sine of the angle of refraction = constant
  2. cosine of the angle of incidence/cosine of the angle of refraction = constant
  3. tangent of the angle of incidence/tangent of the angle of refraction = constant
  4. the cotangent of the angle of incidence/cotangent of the angle of refraction = constant
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Answer: Option A. sine of the angle of incidence/sine of the angle of refraction = constant

5. What is the phenomenon of light being deflected when traveling obliquely from one medium to another called?

  1. Reflection
  2. Diffraction
  3. Refraction
  4. Dispersion
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Answer: Option C. Refraction