Indian Navy INET Light - Reflection and Refraction — practice questions

Explore 2 free Light - Reflection and Refraction questions in Indian Navy INET Science. Open each question or exercise to read its content, reference answers and available explanation.

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Light - Reflection and Refraction questions and exercises with answers

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The refractive index of a medium compares the speed of light in:Read the answer and worked solution →The mirror formula relating object distance u, image distance v, and focal length f is:Read the answer and worked solution →

Worked practice questions

The refractive index of a medium compares the speed of light in:

the medium to the object
vacuum to that in the medium
air to water only
two mirrors

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Correct answer: B. vacuum to that in the medium

Refractive index = speed of light in vacuum ÷ speed of light in the medium.

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The mirror formula relating object distance u, image distance v, and focal length f is:

1/v + 1/u = 1/f
v + u = f
1/v - 1/u = 1/f
v × u = f

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Correct answer: A. 1/v + 1/u = 1/f

The mirror formula is 1/v + 1/u = 1/f. It works for all positions of the object and both concave and convex mirrors, with the Cartesian sign convention applied.