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NEET UG Ray Optics and Optical Instruments — practice questions — page 6

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 151–170 of 170.

For a thin prism of small refracting angle A and refractive index n, the deviation δ is approximatelyRead 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 →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 →Cartesian sign convention: positive or negative?Read the answer and worked solution →Critical angleRead 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 →True or false: optical instrumentsRead the answer and worked solution →Which instrument does this belong to?Read the answer and worked solution →A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 25 cm. The power of the combination (in dioptres) isRead the answer and worked solution →Complete the prism relationRead the answer and worked solution →An astronomical telescope in normal adjustment has an objective of focal length 100 cm and an eyepiece of focal length 5 cm. Its angular magnification isRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Which quantity is being described?Read the answer and worked solution →Tap every example of total internal reflectionRead the answer and worked solution →NEET · Physics · Refraction & LensesRead the answer and worked solution →Match each formula to what it describesRead the answer and worked solution →The mirror equation relates u, v and f asRead the answer and worked solution →

Worked practice questions

For a thin prism of small refracting angle A and refractive index n, the deviation δ is approximately

  1. δ = (n − 1) A
  2. δ = A / (n − 1)
  3. δ = A × n²
  4. δ = (n + 1) A
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Correct answer: A. δ = (n − 1) A

1. For a thin prism, deviations at the two faces add; small-angle approximation gives sin θ ≈ θ. 2. The result is δ ≈ (n − 1) A. 3. This is the basis of dispersive power formulas. _Source: syllabus Physics Part II, Ch 9 §9.6_

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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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