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Rajasthan Board Class 12 (RBSE) Ray and Wave Optics — practice questions

Explore 30 free Ray and Wave Optics questions in Rajasthan Board Class 12 (RBSE) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Ray and Wave Optics questions and exercises with answers

Showing questions 1–30 of 30.

Light passes from air to glass ($n = 1.5$). Brewster's angle is:Read the answer and worked solution →An object is placed 30 cm from a concave mirror of focal length 20 cm. The image distance isRead 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 →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 →Assertion and reason: instrumentsRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →

Worked practice questions

Light passes from air to glass ($n = 1.5$). Brewster's angle is:

  1. $30^\circ$, half the right angle on the boundary
  2. $45^\circ$, the diagonal angle for any clear glass
  3. $56.3^\circ$, since $\tan\theta_B = n = 1.5$
  4. $60^\circ$, twice the standard small angle here
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Correct answer: C. $56.3^\circ$, since $\tan\theta_B = n = 1.5$

$\tan\theta_B = 1.5$, $\theta_B = \tan^{-1}(1.5) \approx 56.3^\circ$.

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An object is placed 30 cm from a concave mirror of focal length 20 cm. The image distance is

  1. +60 cm
  2. +12 cm
  3. −12 cm
  4. −60 cm
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Correct answer: D. −60 cm

1. With your syllabus signs: u = −30 cm, f = −20 cm. 2. 1/v + 1/u = 1/f ⇒ 1/v = 1/f − 1/u = −1/20 + 1/30 = (−3 + 2)/60 = −1/60. 3. v = −60 cm — image is real (negative v in this convention) and 60 cm in front of the mirror. _Source: syllabus Physics Part II, Ch 9 §9.2.3 worked example pattern_

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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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More Physics topics

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