Get 2 FREE Instant-Explanations on Filo with code FILOAPP

Home

Class 12

Physics

Ray Optics and Optical Instruments

Thin lens

An object 2.4 {~m} infront of a lens forms a sharp image on a

Question

Medium

Solving time: 3 mins

An object $2.4 m$ infront of a lens forms a sharp image on a film $12 cm$ behind the lens. A glass plate $1 cm$ thick, of refractive index $1.50$ is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film?

7.2 m

2.4 m

3.2 m

5.6 m

Views: 5,598 students

Updated on: Jun 22, 2023

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2012

Found 7 tutors discussing this question

Asher Discussed

An object

2.4 m

infront of a lens forms a sharp image on a film

12 cm

behind the lens. A glass plate

1 cm

thick, of refractive index

1.50

is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film?

9 mins ago

Discuss this question LIVE

9 mins ago

Text solutionVerified

Shift in image position due to glass plate,

S = (1 - \frac{1}{μ}) t = (1 - \frac{1}{1.5}) \times 1 cm = \frac{1}{3} cm

For focal length of the lens,

\frac{1}{f} = \frac{1}{v} - \frac{1}{u} = \frac{1}{12} - \frac{1}{- 240}

\frac{1}{f} = \frac{20 + 1}{240}

\Rightarrow f = \frac{240}{21} cm

Now, to get back image on the film, lens has to form image at

(12 - \frac{1}{3}) cm = \frac{35}{3} cm

such that the glass plate will shift the image on the film.
As

\frac{1}{f} = \frac{1}{v} - \frac{1}{u}

\Rightarrow \frac{1}{u} = \frac{1}{v} - \frac{1}{f} = \frac{3}{35} - \frac{21}{240}

= \frac{48 \times 3 - 7 \times 21}{1680}

= - \frac{1}{560}

\Rightarrow u = - 5.6 m

Was this solution helpful?

Report

Filo tutor solutions (4)

Learn from their 1-to-1 discussion with Filo tutors.

26 mins

Uploaded on: 3/7/2023

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

ABHAY SINGH

Total classes on Filo by this tutor - 3,013

Teaches : Physics, Mathematics

Connect instantly with this tutor

Connect now

Notes from this class (3 pages)

Download

Was this solution helpful?

150

Report

1 mins

Uploaded on: 1/4/2023

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Anand Kumar

Total classes on Filo by this tutor - 2,813

Teaches : Physics, Mathematics, Organic Chemistry

Connect instantly with this tutor

Connect now

Notes from this class (1 pages)

Download

Was this solution helpful?

142

Report

5 mins

Uploaded on: 6/22/2023

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Sudesh Verma

Total classes on Filo by this tutor - 16,053

Teaches : Physics, Biology, Organic Chemistry

Connect instantly with this tutor

Connect now

Notes from this class (2 pages)

Download

Was this solution helpful?

147

Report

See more 1-on-1 discussions (1)

One destination for complete JEE/NEET preparation

One destination to cover all your homework and assignment needs

Learn Practice Revision Succeed

Instant 1:1 help, 24x7

60, 000+ Expert tutors

Textbook solutions

Big idea maths, McGraw-Hill Education etc

Essay review

Get expert feedback on your essay

Schedule classes

High dosage tutoring from Dedicated 3 experts

Trusted by 4 million+ students

Stuck on the question or explanation?

Connect with our Physics tutors online and get step by step solution of this question.

231 students are taking LIVE classes

Question Text	An object $2.4 m$ infront of a lens forms a sharp image on a film $12 cm$ behind the lens. A glass plate $1 cm$ thick, of refractive index $1.50$ is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film?
Updated On	Jun 22, 2023
Topic	Ray Optics and Optical Instruments
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 4
Upvotes	623
Avg. Video Duration	9 min

Text solutionVerified

Filo tutor solutions (4)

Questions from JEE Mains 2012 - PYQs

Practice questions from Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Practice questions from Ray Optics and Optical Instruments in the same exam

Practice more questions from Ray Optics and Optical Instruments

Practice questions on similar concepts asked by Filo students

An object 2.4 m infront of a lens forms a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50 is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film?

Text solutionVerified

Filo tutor solutions (4)

Questions from JEE Mains 2012 - PYQs

Practice questions from Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Practice questions from Ray Optics and Optical Instruments in the same exam

Practice more questions from Ray Optics and Optical Instruments

Practice questions on similar concepts asked by Filo students

Related books for questions on Ray Optics and Optical Instruments

Previous year question papers