Q22.In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of 45∘ with the x-axis meets the experimental curve at P . The coordinates of P will be (1) (2f, 2f) (2) ( f2 , f2 ) (3) (f, f) (4) (4f, 4f)
What This Question Tests
This question requires interpreting the lens formula in the context of a u-v graph. The point where u=v implies that the object and image distances are equal, which for a convex lens occurs when both are at 2f.
Concepts Tested
Formulas Used
1/f = 1/v - 1/u
📚 NCERT Sections This Tests
9.19 — A Screen Is Placed 90Cm From An Object. The Image Of The Object On
Physics Class 12 · Chapter 9
9.19 A screen is placed 90cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the lens.
9.8 — A Beam Of Light Converges At A Point P. Now A Lens Is Placed In The
Physics Class 12 · Chapter 9
9.8 A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20cm, and (b) a concave lens of focal length 16cm?
9.7 — Double-Convex Lenses Are To Be Manufactured From A Glass Of
Physics Class 12 · Chapter 9
9.7 Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20cm?
📋 Question Details
- Chapter
- Ray Optics
- Topic
- Lens formula and image formation by convex lens
- Year
- 2009
- Shift
- Unknown
- Q Number
- Q22
- Type
- Graph based
- NCERT Ref
- Class 12 Physics Ch 9: Ray Optics and Optical Instruments
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