All Courses
Get the App Signup / Login
Sign in Open App
Grade 12 Exam  >  Grade 12 Tests  >  Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Grade 12 MCQ

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Grade 12 MCQ


Test Description

10 Questions MCQ Test - Assertion & Reason Test: Ray Optics & Optical Instruments - 1

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 for Grade 12 2024 is part of Grade 12 preparation. The Assertion & Reason Test: Ray Optics & Optical Instruments - 1 questions and answers have been prepared according to the Grade 12 exam syllabus.The Assertion & Reason Test: Ray Optics & Optical Instruments - 1 MCQs are made for Grade 12 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 below.
Solutions of Assertion & Reason Test: Ray Optics & Optical Instruments - 1 questions in English are available as part of our course for Grade 12 & Assertion & Reason Test: Ray Optics & Optical Instruments - 1 solutions in Hindi for Grade 12 course. Download more important topics, notes, lectures and mock test series for Grade 12 Exam by signing up for free. Attempt Assertion & Reason Test: Ray Optics & Optical Instruments - 1 | 10 questions in 20 minutes | Mock test for Grade 12 preparation | Free important questions MCQ to study for Grade 12 Exam | Download free PDF with solutions
Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 1
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): The focal length of a concave mirror is f and an object is placed at a distance x from the focus. The magnification produced by the mirror is f/x.

Reason (R): magnification = size of image / size of object

Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 1
u = f+x

Using mirror formula,

1/v+1/u = 1/f

Or, 1/v – 1/(f+x) = – 1/f

∴ v = – f(f+x)/x

Magnification (m) = size of image / size of object = – v/u

So, the assertion and reason both are true and the reason properly explains the assertion.

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 2
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Air bubbles shine in water.

Reason (R): Air bubbles shine in water due to refraction of light.

Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 2

When the rays go from water into the air bubble, they suffer total internal reflection. now they are reflected back as if from a mirror. hence air bubble shines like a mirror.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 3
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): A double convex air bubble is formed within a glass slab. The air bubble behaves like a converging lens.

Reason (R): Refractive index of glass is more than the refractive index of air.

Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 3
Speed of light is slower in glass compared to that in air. Hence the refractive index of glass is more than that of air. So the reason is true.

When a double convex air bubble is formed within a glass slab, the refractive index of the medium of the bubble is less than the refractive index of the surrounding medium. Hence the lens will not behave like a converging lens. It will behave like a diverging lens. So, the assertion is false.

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 4
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): A convex lens of focal length 30 cm can’t be used as a simple microscope in normal setting.

Reason (R): For normal setting, the angular magnification of simple microscope is M = D/f.
Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 4
For normal adjustment, a 30 cm lens final image cannot form image at the near point (25 cm from the eye). So the statement is true.
Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 5
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Convex lens behaves like a simple microscope.

Reason (R): For larger magnifying power, the focal length of convex lens should be small.
Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 5
Convex lens behaves like a simple microscope. The assertion is true.

The magnifying power of a convex lens is expressed as:

  • For least distance of distinct vision,

  • For relaxed eye, m = D/f

Since f is in the denominator, for larger magnifying power, focal length should be small. So, the reason is also correct and it is the assertion.

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 6
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): A convex mirror cannot form real images.

Reason (R): Convex mirror converges the parallel rays that are incident on it.
Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 6
Convex mirror always form virtual image. So, the assertion is true.

Parallel rays incident on convex mirror do not actually meet. They get reflected in such a manner that their extension meet at a point. So, the reason is false.

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 7
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): The mirror formula 1/v + 1/u = 1/f is valid for mirrors of small aperture.

Reason (R): Laws of reflection of light is valid for only plane surface and not for large spherical surface.
Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 7
The mirror formula is derived under the consideration that the incident rays are paraxial which means that the rays lie very close to the principal axis. Hence the mirror aperture is considered to be small. So, the assertion is true.

Laws of reflection are valid for any surface plane or spherical. Hence the reason is false.

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 8
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): A diamond of refractive index √6 is immersed in a liquid of refractive index √3 . If light travels from diamond to liquid, total internal reflection will take place when angle of incidence is 30°.

Reason (R): µ = 1/sin C, where µ is the refractive index of diamond with respect to the liquid
Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 8
Refractive index of diamond with respect to the liquid is √6 / √3 = √2 So, the critical angle for the diamond-liquid pair of media is sin–1(1/ √2 ) = 45°.

For total internal reflection, angle of incidence should be greater that critical angle.

Since angle of incidence is 30°, total internal reflection cannot take place.

So, the assertion is false. But the reason is true.

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 9
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): The scattering of light while passing through a true solution is called Tyndall effect.

Reason (R): Intensity of scattered light is inversely proportional to the fourth power of wavelength.
Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 9
When light is passed through a true solution does not occur. Scattering occurs when light is passed through a colloidal solution. So, the assertion is false.

In Rayleigh scattering intensity of scattered light is inversely proportional to the fourth power of wavelength, blue light is scattered much more strongly than red light. Hence the reason is true.

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 10
Save

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): If the objective lens and the eyepiece lens of a microscope are interchanged, it works as a telescope.

Reason (R): Objective lens of telescope require large focal length and eyepiece lens require small focal length.
Detailed Solution for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 - Question 10
Magnification of microscope is inversely proportional to focal lengths of objective lens and the eyepiece lens. Hence both the focal lengths are small. On the other hand, magnification of microscope is inversely proportional to focal lengths of eyepiece lens and directly proportional to the objective lens. So, the focal length of the objective lens is large and the focal length of the eyepiece lens is small.

Hence, if the objective lens and the eyepiece lens of a microscope are interchanged that will not meet the criterion of the telescope.

So, the reason is true. But the assertion is false.

Information about Assertion & Reason Test: Ray Optics & Optical Instruments - 1 Page
In this test you can find the Exam questions for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 solved & explained in the simplest way possible. Besides giving Questions and answers for Assertion & Reason Test: Ray Optics & Optical Instruments - 1, EduRev gives you an ample number of Online tests for practice

Top Courses for Grade 12

Download as PDF

Top Courses for Grade 12

Important Questions for Assertion & Reason Test: Ray Optics & Optical Instruments - 1

Find all the important questions for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 at EduRev.Get fully prepared for Assertion & Reason Test: Ray Optics & Optical Instruments - 1 with EduRev's comprehensive question bank and test resources. Our platform offers a diverse range of question papers covering various topics within the Assertion & Reason Test: Ray Optics & Optical Instruments - 1 syllabus. Whether you need to review specific subjects or assess your overall readiness, EduRev has you covered. The questions are designed to challenge you and help you gain confidence in tackling the actual exam. Maximize your chances of success by utilizing EduRev's extensive collection of Assertion & Reason Test: Ray Optics & Optical Instruments - 1 resources.

Assertion & Reason Test: Ray Optics & Optical Instruments - 1 MCQs with Answers

Prepare for the Assertion & Reason Test: Ray Optics & Optical Instruments - 1 within the Grade 12 exam with comprehensive MCQs and answers at EduRev. Our platform offers a wide range of practice papers, question papers, and mock tests to familiarize you with the exam pattern and syllabus. Access the best books, study materials, and notes curated by toppers to enhance your preparation. Stay updated with the exam date and receive expert preparation tips and paper analysis. Visit EduRev's official website today and access a wealth of videos and coaching resources to excel in your exam.

Online Tests for Assertion & Reason Test: Ray Optics & Optical Instruments - 1

Practice with a wide array of question papers that follow the exam pattern and syllabus. Our platform offers a user-friendly interface, allowing you to track your progress and identify areas for improvement. Access detailed solutions and explanations for each test to enhance your understanding of concepts. With EduRev's Online Tests, you can build confidence, boost your performance, and ace Assertion & Reason Test: Ray Optics & Optical Instruments - 1 with ease. Join thousands of successful students who have benefited from our trusted online resources.
© EduRev
Education Revolution
Follow Us
Signup on EduRev and stay on top of your study goals
10M+ students crushing their study goals daily