9394949438

[LATEST]$type=sticky$show=home$rm=0$va=0$count=4$va=0

 




Ray Optics and Optical Instruments Quiz-19

Dear Readers,


As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. .

Q1.  Venus looks brighter than other stars because
  •   It has higher density than other stars
  •   It is closer to the earth than other stars
  •   It has no atmosphere
  •   Atomic fission takes place on its surface
Solution
𝐼 ∝ 1/π‘Ÿ2

Q2. A ray of light travelling in water is incident on its surface open to air. The angle of incidence isΞΈ, which is less than the critical angle. Then there will be
  •   Only a reflected ray and no reflected ray
  •   Only a reflected ray and no reflected ray
  •   A reflected ray and a refracted ray and the angle between then would be less than 108° − 2ΞΈ
  •   A reflected ray and a refracted ray and the angle between then would be greater than 108° − 2ΞΈ
Solution
Since ΞΈ < ΞΈc, both reflection and refraction will take place. From the figure we can see that angle between reflected and refracted rays 𝛼is less than 180° − 2ΞΈ.



Q3.   If the focal length of objective and eye lens are 1.2 π‘π‘š and 3 π‘π‘š respectively and the object is put 1.25 π‘π‘š away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is
  •   150
  •   200
  •   250
  •   400
Solution
π‘š∞ = − 𝑣o/𝑒0 × π·/𝑓e From 1/𝑓o = 1/𝑣o − 1/𝑒o ⇒ 1/(+1.2) = 1/𝑣o − 1/(−1.25) ⇒ 𝑣o = 30 π‘π‘š ∴ |π‘š| = 30/1.25 × 25/3 = 200

Q4.  The refractive index of a piece of transparent quartz is the greatest for
  •   Red light
  •   Violet light
  •   Green light
  •   Yellow light
Solution
πœ‡ ∝ 1/πœ† ,πœ†π‘Ÿ > πœ†π‘£


Q5. Refractive index for a material for infrared light is
  •   Equal to that of ultraviolet light
  •   Less than for ultraviolet light
  •   Equal to that for red colour of light
  •   Greater than that for ultraviolet light
  • Solution
      πœ‡ ∝ 1/πœ† .

    Q6.  In vacuum the speed of light depends upon
    •   Frequency
    •   Wave length
    • Velocity of the source of light
    •   None of these
    Solution
    In vacuum speed of light is constant and is equal to 3 × 10π‘š/𝑠


    Q7. A point source of light moves in a straight line parallel to a plane table. Consider a small portion of the table directly below the line of movement of the source. The illuminance at this portion varies with this distance π‘Ÿ from the source as
    •   ∝ 1/π‘Ÿ
    •   ∝ 1/π‘Ÿ2
    •   ∝ 1/π‘Ÿ3
    •   ∝1/π‘Ÿ3
    Solution

    𝐸 = 𝐼 cosΞΈ/π‘Ÿ2 ⇒ 𝐸 = πΌβ„Ž/π‘Ÿ3

     
      Or 𝐸 ∝ 1/π‘Ÿ3

    Q8. When a plane mirror is placed horizontally on a level ground at a distance of 60π‘š from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of 90° at the 𝑒𝑦𝑒. The height of the tower will be
    •   30π‘š
    •   60π‘š
    •   90π‘š
    •   120π‘š
    Solution
    tan45° = β„Ž/60 ⇒ β„Ž = 60 π‘š


    Q9. The distance 𝜈 of the real image formed by a convex lens is measured for various object distance 𝑒 . A graph is plotted between 𝜈 and 𝑒 . Which one of the following graphs is correct?

    •  

    •  

    •   

    •   

    Solution
    Think in terms of rectangular hyperbola

    Q10.  A plano-convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now, this lens has been used to from the image of an object. At what distance from this lens, an object be placed in order to have a real image of the size of the object?
    •   20cm
    •   30cm
    •   60cm
    •   80cm
    Solution
    A plano-convex lens behaves as a concave mirror if it’s one surface (curved) is silvered. The rays refracted from plane surface are reflected from curved surface and again refract from plane surface. Therefore, in this lens two refractions and one reflection occur. Let the focal length of silvered lens is 𝐹. /𝐹 = 1/𝑓 + 1/𝑓 + 1/𝑓m = 2/𝑓 + 1/𝑓m Where 𝑓 = focal length of lens before silvering 𝑓m =focal length of spherical mirror.
    ∴ 1/𝐹 = 2/𝑓 + 2/𝑅 …..(𝑖) 
    (∵ 𝑅 = 2𝑓m π‘›π‘œπ‘€ , 1 𝑓 = (πœ‡ − 1)(1 𝑅₁ - 1 𝑅₂ ) ….(𝑖𝑖) 
     β„Žπ‘’π‘Ÿπ‘’, 𝑅₁ = ∞,𝑅₂ = 30 π‘π‘š ∴ 1/𝑓 = (1.5 − 1)(1/∞−1/30) ⟹ 1/𝑓= − 0.5/30= −1/60 ⟹ 𝑓 = −60 π‘π‘š
     Hence from eq (i) 1/𝐹 = 2/60 + 2/30 = 6/60 𝐹 = 10 π‘π‘š
     Again given that, Size of object = size of image ⟹ 𝑂 = 𝐼 ∴ π‘š = −𝑣/𝑒 = 𝐼/𝑂 ⟹ 𝑣/𝑒 = −1 ⟹ 𝑣 = −𝑒 Thus, from lens formula 1/𝐹 = 1/𝑣 − 1/𝑒 1/10 = 1/−𝑒 − 1/𝑒 1/10
     = − 2/𝑒 ∴ 𝑒 = −20 π‘π‘š 
    Hence, to get a real image, object must be placed at a distance 20 cm on the left side of lens

    Want to know more

    Please fill in the details below:

    INNER POST ADS

    Latest IITJEE Articles$type=three$c=3$author=hide$comment=hide$rm=hide$date=hide$snippet=hide

    Latest NEET Articles$type=three$c=3$author=hide$comment=hide$rm=hide$date=hide$snippet=hide

    Name

    Admissions,1,Alternating Current,60,AP EAMCET 2020,1,Basic Maths,2,BCECE 2020,1,best books for iit jee,2,best coaching institute for iit,1,best coaching institute for iit jee preparation,1,best iit jee coaching delhi,1,best iit jee coaching in delhi,2,best study material for iit jee,4,BITSAT Registration 2020,1,Blog,62,books for jee preparation,1,books recommended by iit toppers,3,Capacitance,3,CBSE,1,CBSE accounts exam,1,CBSE boards,1,CBSE NEET,9,cbse neet 2019,3,CBSE NEET 2020,1,cbse neet nic,1,Centre of Mass,2,Chemistry,58,Class 12 Physics,15,coaching for jee advanced,1,coaching institute for iit jee,2,Collision,2,COMEDK UGET 2020 Application Form,1,COMEDK UGET 2020 Exam Form,1,COMEDK UGET news,1,CUCET 2020,2,Current Electricity,4,CVR college,1,Electromagnetic Induction,3,Electronics,1,Electrostatics,3,Energy,1,Engineering & Medical,1,Fluid Mechanics,4,Gravitation,2,GUJCET 2020 Application Form,1,Heat,4,iit admission,1,iit advanced,1,iit coaching centre,3,iit coaching centre in delhi,2,iit coaching classes,2,iit coaching in delhi,1,iit coaching institute in delhi,1,iit entrance exam,1,iit entrance exam syllabus,2,iit exam pattern,2,iit jee,5,iit jee 2019,3,iit jee advanced,2,iit jee books,3,iit jee coaching,2,iit jee exam,3,iit jee exam 2019,1,iit jee exam pattern,3,iit jee institute,1,iit jee main 2019,2,iit jee mains,3,iit jee mains syllabus,2,iit jee material,1,iit jee online test,3,iit jee practice test,3,iit jee preparation,6,iit jee preparation in delhi,2,iit jee preparation time,1,iit jee preparation tips by toppers,2,iit jee question paper,1,iit jee study material,3,iit jee study materials,2,iit jee syllabus,2,iit jee syllabus 2019,2,iit jee test,3,iit preparation,2,iit preparation books,5,iit preparation time table,2,iit preparation tips,2,iit syllabus,2,iit test series,3,IITJEE,100,IPU CET,1,JEE Advanced,83,jee advanced exam,2,jee advanced exam pattern,1,jee advanced paper,1,JEE Books,1,JEE Coaching Delhi,3,jee exam,3,jee exam 2019,6,JEE Exam Pattern,2,jee exam pattern 2019,1,jee exam preparation,1,JEE Main,85,jee main 2019,4,JEE Main 2020,1,JEE Main 2020 Application Form,2,JEE Main 2020 news,2,JEE Main 2020 Official Answer Key,1,JEE Main 2020 Registration,1,JEE Main 2020 Score,1,JEE Main application form,1,jee main coaching,1,JEE Main eligibility criteria,3,jee main exam,1,jee main exam 2019,3,jee main online question paper,1,jee main online test,3,JEE Main Paper-2 Result,1,jee main registration,2,jee main syllabus,2,JEE mains 2020,1,jee mains question bank,1,jee mains test papers,3,JEE Mock Test,2,jee notes,1,jee past papers,1,JEE Preparation,2,jee preparation in delhi,1,jee preparation material,4,JEE Study Material,1,jee syllabus,6,JEE Syllabus Chemistry,1,JEE Syllabus Maths,1,JEE Syllabus Physics,1,jee test series,3,KCET - 2020,1,Kinematics,1,Latest article,5,Latest Articles,61,Latest News,34,latest news about neet exam,1,Laws of Motion,2,Magnetic Effect of Current,3,Magnetism,3,MHT CET 2020,2,MHT CET 2020 exam schedule,1,Modern Physics,1,NCERT Solutions,15,neet,3,neet 2019,1,neet 2019 eligibility criteria,1,neet 2019 exam date,2,neet 2019 test series,2,NEET 2020,2,NEET 2020 Application Form,1,NEET 2020 Eligibility Criteria,1,NEET 2020 Registration,1,neet application form,1,neet application form 2019 last date,1,Neet Biology Syllabus,1,Neet Books,3,neet eligibility criteria,3,neet exam 2019,7,neet exam application,1,neet exam date,1,neet exam details,1,neet exam pattern,6,neet exam pattern 2019,2,neet examination,1,neet mock test 2019,1,Neet Notes,3,Neet Online Application Form,3,neet online test,2,neet past papers,1,neet physics syllabus,1,neet practice test,2,NEET preparation books,1,neet qualification marks,1,NEET question paper 2019,1,neet question papers,1,neet registration,1,Neet Study Material,3,neet syllabus,6,neet syllabus 2019,5,NEET Syllabus 2020,1,neet syllabus chemistry,1,neet syllabus for biology,1,neet syllabus for physics,1,neet test series,1,neet ug 2019,2,news,5,online study material for iit jee,1,Optical Instruments,1,Physics,110,physics books for iit jee,1,Power,1,Practical Physics,1,Quiz,5,Ray Optics,1,Rotational Motion,3,SHM,3,Simple Harmonic Motion,3,study materials for iit jee,1,Study Notes,110,study notes for iit jee,1,Thermodynamics,4,TS EAMCET Notification,2,Units and Dimensions,1,UPSEE 2020,1,UPSEE 2020 Application Form,2,UPSEE EXAM,1,Vectors,2,VITEE Application form,1,Wave Motion,3,Wave Optics,1,WBJEE 2020 Admit Card,1,WBJEE 2020 Answer Key,1,Work,1,
    ltr
    item
    BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET, IIT JEE COACHING INSTITUTE: RAY OPTICS AND OPTICAL INSTRUMENTS QUIZ 19
    RAY OPTICS AND OPTICAL INSTRUMENTS QUIZ 19
    https://1.bp.blogspot.com/-xE9USkAlg80/X5kvlfNeiRI/AAAAAAAAB2E/VhsuiThamgYMXyyz2p5t2OgQo8CKBvMNQCLcBGAsYHQ/w393-h234/Quiz%2BImage%2B20%2B%25288%2529.png
    https://1.bp.blogspot.com/-xE9USkAlg80/X5kvlfNeiRI/AAAAAAAAB2E/VhsuiThamgYMXyyz2p5t2OgQo8CKBvMNQCLcBGAsYHQ/s72-w393-c-h234/Quiz%2BImage%2B20%2B%25288%2529.png
    BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET, IIT JEE COACHING INSTITUTE
    https://www.cleariitmedical.com/2020/10/ray-optics-and-optical-instruments-quiz-19.html
    https://www.cleariitmedical.com/
    https://www.cleariitmedical.com/
    https://www.cleariitmedical.com/2020/10/ray-optics-and-optical-instruments-quiz-19.html
    true
    7783647550433378923
    UTF-8
    Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy