All Courses
Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity Get the App Login Join for Free
Sign in Open App
Class 12 Exam  >  Class 12 Questions  >  A concave lens of glass, refractive index 1.5... Start Learning for Free
SaveJoin the Discussion on the App
A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​
  • a)
    convergent lens of focal length 3.5R
  • b)
    divergent lens of focal length 3.5R
  • c)
    divergent lens of focal length 3.0R
  • d)
    convergent lens of focal length 3.0R
Correct answer is option 'A'. Can you explain this answer?
FREE This question is part of
Download PDF Attempt Test
Download PDF Attempt this Test
Verified Answer
A concave lens of glass, refractive index 1.5, has both surfaces of sa...
View all questions of this test
Most Upvoted Answer
A concave lens of glass, refractive index 1.5, has both surfaces of sa...
Explanation:
When a concave lens of glass, refractive index 1.5, is immersed in a medium of refractive index 1.75, the following changes occur:

1. Curvature of the lens: Since the medium has a higher refractive index than the lens, the curvature of the lens will increase.

2. Focal length: The focal length of the lens will decrease as the curvature of the lens increases.

3. Behavior of the lens: A concave lens always diverges light, regardless of the medium it is immersed in. However, the degree of divergence changes with the refractive index of the medium.

Based on these changes, we can determine the correct answer to the given question.

Option A: Convergent lens of focal length 3.5R

This option is incorrect because a concave lens can never converge light, regardless of the medium it is immersed in. Therefore, option A is not the correct answer.

Option B: Divergent lens of focal length 3.5R

This option is incorrect because the lens is a concave lens, which always diverges light. Therefore, option B is not the correct answer.

Option C: Divergent lens of focal length 3.0R

This option is incorrect because the refractive index of the medium is higher than that of the lens. Therefore, the lens will have a shorter focal length, and the degree of divergence will be greater than if the lens were in air. Therefore, option C is not the correct answer.

Option D: Convergent lens of focal length 3.0R

This option is incorrect for the same reason as option A. A concave lens can never converge light, regardless of the medium it is immersed in. Therefore, option D is not the correct answer.

Conclusion:
The correct answer is option A. When a concave lens of glass, refractive index 1.5, is immersed in a medium of refractive index 1.75, it will behave as a divergent lens with a shorter focal length. The focal length will be 3.5 times the radius of curvature of the lens.
< Previous Question Next Question >
Explore Courses for Class 12 exam

Similar Class 12 Doubts

Read the following text and answer the following questions on the basis of the same:Negative Refractive Index: One of the most fundamental phenomena in optics is refraction. When a beam of light crosses the interface between two different materials, its path is altered depending on the difference in the refractive indices of the materials. The greater the difference, the greater the refraction of the beam. For all known naturally occurring materials the refractive index assumes only positive values. But does this have to be the case?In 1967, Soviet physicist Victor Veselago hypothesized that a material with a negative refractive index could exist without violating any of the laws of physics.Veselago predicted that this remarkable material would exhibit a wide variety of new optical phenomena. However, until recently no one had found such a material and Veselago’s ideas had remained untested. Recently, meta-material samples are being tested for negative refractive index. But the experiments show significant losses and this could be an intrinsic property of negativeindex materials.Snell’s law is satisfied for the materials having a negative refractive index, but the direction of the refracted light ray is ‘mirror-imaged’ about the normal to the surface.There will be an interesting difference in image formation if a vessel is filled with “negative water” having refractive index – 1.33 instead of regular water having refractive index 1.33.Say, there is a fish in a vessel filled with negative water. The position of the fish is such that the observer cannot see it due to normal refraction since the refracted ray does not reach to his eye.But due to negative refraction, he will be able to see it since the refracted ray now reaches his eye.Q. A ray incident on normal glass and “negative glass” at an angle 60°. If the magnitude of angle of refraction in normal glass is 45° then, what will be the magnitude of angle of refraction in the “negative glass”?

A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer?
Question Description
A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer?.
Solutions for A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​a)convergent lens of focal length 3.5Rb)divergent lens of focal length 3.5Rc)divergent lens of focal length 3.0Rd)convergent lens of focal length 3.0RCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 12 tests.
Explore Courses for Class 12 exam
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Get App
© EduRev
Education Revolution
Follow Us
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup