NEET Exam  >  NEET Questions  >  A concave lens is placed in contact with a co... Start Learning for Free
A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens is
  • a)
    −400 cm
  • b)
    −200 cm
  • c)
    +400 cm
  • d)
    +200 cm 
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A concave lens is placed in contact with a convex lens of focal length...
For the combination of lens,
Here, u = −40 cm, v = +80 cm,f = ?





⇒ f2 = −400cm
View all questions of this test
Most Upvoted Answer
A concave lens is placed in contact with a convex lens of focal length...
To find the focal length of the concave lens, we can use the lens formula:

1/f = 1/v - 1/u

where f is the focal length, v is the image distance, and u is the object distance.

Given:
focal length of the convex lens = 25 cm
image distance = 80 cm
object distance = 40 cm

Using the lens formula, we have:

1/f = 1/80 - 1/40

Simplifying,

1/f = (1/80) - (2/80)
1/f = -1/80

Taking the reciprocal of both sides,

f = -80 cm

Therefore, the focal length of the concave lens is -80 cm.
Attention NEET Students!
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.
Explore Courses for NEET exam

Top Courses for NEET

A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer?
Question Description
A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer?.
Solutions for A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.
Here you can find the meaning of A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A concave lens is placed in contact with a convex lens of focal length 25 cm. The combination produces a real image at a distance of 80 cm, If an object is at a distance of 40 cm, the focal length of concave lens isa)−400 cmb)−200 cmc)+400 cmd)+200 cmCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice NEET tests.
Explore Courses for NEET exam

Top Courses for NEET

Explore Courses
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