JEE Main Optics: Ray Optics – Chapter Test

Topics in this test

Difficulty: 9 medium · 11 hard

Ray Optics MCQ questions with answers

The first 3 of 20 questions. Unlock the series for the rest, each with a solution.

1. Q1. A prism of refracting angle 60° produces a minimum deviation of 30°. The refractive index of the material of the prism is:

   60° अपवर्तक कोण वाला एक प्रिज़्म 30° का न्यूनतम विचलन उत्पन्न करता है। प्रिज़्म के पदार्थ का अपवर्तनांक है:

   • A. 1.33
   • B. √3
   • C. 1.50
   • D. √2
   Solution

   n = sin[(A + D_m)/2] / sin(A/2) = sin 45° / sin 30° = 0.7071/0.5 = √2.

   n = sin[(A + D_m)/2] / sin(A/2) = sin 45° / sin 30° = 0.7071/0.5 = √2।

2. Q2. A magnifying glass of focal length 5 cm is used as a simple microscope with the final image formed at the least distance of distinct vision (25 cm). Its magnifying power is:

   5 cm फोकस दूरी वाले एक आवर्धक लेंस को सरल सूक्ष्मदर्शी के रूप में उपयोग किया जाता है जिसमें अंतिम प्रतिबिंब स्पष्ट दृष्टि की न्यूनतम दूरी (25 cm) पर बनता है। इसकी आवर्धन क्षमता है:

   • A. 1
   • B. 5
   • C. 6
   • D. 25
   Solution

   For image at the near point, M = 1 + D/f = 1 + 25/5 = 6.

   निकट बिंदु पर प्रतिबिंब के लिए, M = 1 + D/f = 1 + 25/5 = 6।

3. Q3. A plane mirror is rotated through 20° about an axis in its plane, while the direction of the incident ray is kept fixed. The reflected ray turns through an angle of:

   एक समतल दर्पण को उसके तल में स्थित अक्ष के परितः 20° घुमाया जाता है, जबकि आपतित किरण की दिशा स्थिर रखी जाती है। परावर्तित किरण जिस कोण से घूम जाती है, वह है:

   • A. 20°
   • B. 80°
   • C. 10°
   • D. 40°
   Solution

   When a plane mirror is rotated by an angle θ with the incident ray fixed, the reflected ray rotates by 2θ, because both the angle of incidence and the angle of reflection change by θ. Here the reflected ray turns through 2 × 20° = 40°.

   जब आपतित किरण को स्थिर रखते हुए समतल दर्पण को θ कोण से घुमाया जाता है, तो परावर्तित किरण 2θ से घूम जाती है, क्योंकि आपतन कोण तथा परावर्तन कोण दोनों में θ का परिवर्तन होता है। यहाँ परावर्तित किरण 2 × 20° = 40° से घूमती है।

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