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NEET UG Ray Optics and Optical Instruments — practice questions — page 2

Explore 170 free Ray Optics and Optical Instruments questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Ray Optics and Optical Instruments questions and exercises with answers

Showing questions 31–60 of 170.

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 →A thin prism of refracting angle 5° is made of glass with n = 1.5. The deviation δ of a light ray passing through it is approximatelyRead the answer and worked solution →Two thin convex lenses, each of focal length 20 cm, are placed coaxially 10 cm apart in air. The equivalent focal length of the combination isRead the answer and worked solution →NEET · Physics · Refraction & LensesRead the answer and worked solution →NEET · Physics · Image — Real or VirtualRead the answer and worked solution →NEET · Physics · True or False — OpticsRead the answer and worked solution →Cartesian sign convention: positive or negative?Read the answer and worked solution →True or false: the sign conventionRead the answer and worked solution →Complete the condition for total internal reflectionRead the answer and worked solution →Tap every example of total internal reflectionRead the answer and worked solution →Critical angleRead the answer and worked solution →True or false: optical fibresRead the answer and worked solution →Match each formula to what it describesRead the answer and worked solution →Converging or diverging?Read the answer and worked solution →Complete the definition of lens powerRead the answer and worked solution →Lenses in contactRead the answer and worked solution →Order the steps: solve a mirror problemRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Match each instrument to its magnifying powerRead the answer and worked solution →True or false: optical instrumentsRead the answer and worked solution →Which instrument does this belong to?Read the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every statement true of refractionRead the answer and worked solution →Complete the prism relationRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Reading the laws backRead the answer and worked solution →Order the reasoning: why an optical fibre worksRead the answer and worked solution →True or false: mirrors and lensesRead the answer and worked solution →

Worked practice questions

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,

  1. (3/4) h
  2. (1/4) h
  3. h
  4. (4/3) h
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Correct answer: A. (3/4) h

1. Refraction at a flat surface: apparent depth = real depth × (n_observer / n_medium). 2. Viewing from air into water: apparent depth = h × (1 / (4/3)) = (3/4) h. 3. The pool looks shallower than it is; (A) inverts the ratio. _Source: syllabus Physics Part II, Ch 9 §9.3 'Real and apparent depth'_

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A thin prism of refracting angle 5° is made of glass with n = 1.5. The deviation δ of a light ray passing through it is approximately

  1. 7.5°
  2. 2.5°
  3. 5.0°
  4. 1.25°
Show answer and solution

Correct answer: B. 2.5°

1. δ = (n − 1) A for a small-angle prism. 2. δ = (1.5 − 1) × 5° = 0.5 × 5° = 2.5°. 3. (A) uses A/4; (C) ignores the (n − 1) factor; (D) doubles incorrectly. _Source: syllabus Physics Part II, Ch 9 §9.6_

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Two thin convex lenses, each of focal length 20 cm, are placed coaxially 10 cm apart in air. The equivalent focal length of the combination is

  1. 13.3 cm
  2. 10 cm
  3. 20 cm
  4. 40 cm
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Correct answer: A. 13.3 cm

1. For two thin lenses separated by distance d: 1/F = 1/f₁ + 1/f₂ − d/(f₁ f₂). 2. 1/F = 1/20 + 1/20 − 10/(20·20) = 0.05 + 0.05 − 0.025 = 0.075. 3. F = 1 / 0.075 ≈ 13.33 cm. _Source: syllabus Physics Part II, Ch 9 §9.5.4 (general two-lens formula)_

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