Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is

  1. Home

- Online Exam Test Papers | - MCQs[multiple choice questions and answers ] | - Mock Test Papers | - Practice Papers | - Sample Test Papers |

Question:
 
Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is

1.10 cm

2.20 cm

3.30 cm

4.40 cm

Posted Date:-2021-03-26 07:51:12

More MCQS Questions and answers

  1. A bearing of a line is also known as
  2. ABCD is a regular parallelogram plot of land whose angle BAD is 60°. If the bearing of the line AB is 30°, the bearing of CD, is
  3. For a closed traverse the omitted measurements may be calculated
  4. The bearings of the lines AB and BC are 146° 30' and 68° 30'. The included angle ABC is
  5. The difference of level between a point below the plane of sight and one above, is the sum of two staff readings and an error would be produced equal to
  6. The most reliable method of plotting a theodolite traverse, is
  7. The slope correction for a length of 30 m along a gradient of 1 in 20, is
  8. True meridians are generally preferred to magnetic meridians because
  9. Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is
  10. Diopter is the power of a lens having a focal length of
  11. In quadrantal bearing system, back bearing of a line may be obtained from its forward bearing, by
  12. Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than
  13. Pick up the correct statement from the following:
  14. The limiting length of an offset does not depend upon
  15. Accuracy of 'fix' by two point problem, is
  16. An ideal vertical curve to join two gradients, is
  17. An imaginary line joining the points of equal elevation on the surface of the earth, represents
  18. Closed contours of decreasing values towards their centre, represent
  19. For the construction of highway (or railway)
  20. For true difference in elevations between two points A and B, the level must be set up
  21. If S is the length of a subchord and R is the radius of simple curve, the angle of deflection between its tangent and sub-chord, in minutes, is equal to
  22. If the radius of a simple curve is R, the length of the chord for calculating offsets by the method of chords produced, should not exceed.
  23. In chain surveying field work is limited to
  24. In chain surveying tie lines are primarily provided
  25. Hydrographic surveys deal with the mapping of
  26. Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm = 20 m, the maximum length of offset should be limited to
  27. One of the Lehmann's rules of plane tabling, is
  28. One of the tacheometric constants is additive, the other constant, is
  29. Pick up the correct statement from the following :
  30. Pick up the correct statement from the following :
  31. Pick up the correct statement from the following :
  32. Pick up the correct statement from the following :
  33. Pick up the method of surveying in which field observations and plotting proceed simultaneously from the following
  34. The 'fix' of a plane table station with three known points, is bad if the plane table station lies
  35. The accuracy of measurement in chain surveying, does not depend upon
  36. The intercept of a staff
  37. The main principle of surveying is to work
  38. The radius of curvature of the arc of the bubble tube is generally kept
  39. The real image of an object formed by the objective, must lie
  40. The sensitiveness of a level tube decreases if
  41. While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is
Search
R4R Team
R4Rin Top Tutorials are Core Java,Hibernate ,Spring,Sturts.The content on R4R.in website is done by expert team not only with the help of books but along with the strong professional knowledge in all context like coding,designing, marketing,etc!