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AAI Junior Executive (ATC) Physics — practice by topic

Browse 90 questions across 7 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physics topics

Ray Optics (32)Ray and Wave Optics (31)Ray Optics and Optical Instruments (31)Current Electricity (29)Electric Charges and Fields (28)Optics (28)Magnetism & EMI (1)

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Snell's law of refraction states:Read the answer and worked solution →For a plane mirror, image is:Read the answer and worked solution →Focal length of a concave mirror with radius of curvature R:Read the answer and worked solution →The apparent depth of an object lying at the bottom of a pool of water (n = 4/3) is, in terms of its real depth h,Read the answer and worked solution →

Worked practice questions

Snell's law of refraction states:

  1. n₁/sin θ = n₂
  2. n₁ sin θ₁ = n₂ sin θ₂
  3. sin θ₁ = sin θ₂
  4. n₁ cos θ₁ = n₂ cos θ₂
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Correct answer: B. n₁ sin θ₁ = n₂ sin θ₂

**Snell's law:** n₁ sin θ₁ = n₂ sin θ₂, where θ₁, θ₂ are angles measured from normal. n = c/v (refractive index). When light enters denser medium, it bends toward normal.

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For a plane mirror, image is:

  1. Virtual, inverted
  2. Real, magnified
  3. Real, inverted
  4. Virtual, erect, same size, behind mirror
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Correct answer: D. Virtual, erect, same size, behind mirror

Plane mirror produces virtual (cannot be projected on screen), erect, same-size image as far behind the mirror as object is in front. Lateral inversion (left ↔ right).

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Focal length of a concave mirror with radius of curvature R:

  1. -R
  2. 2R
  3. R/2
  4. R
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Correct answer: C. R/2

f = R/2 for spherical mirrors (paraxial approximation). For concave (converging) mirror, f > 0 by convention for convex (diverging), f < 0.

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