How could you find the focal length of a convex lens rapidly but approximately?
Download our app for free and get started
To determine the focal length of a convex lens, we put the convex lens in a holder and keep it in front of a distant object like a window or tree, so that the rays coming from the window pass through it. A cardboard screen is put behind the lens. We change the distance of the screen from the convex lens until a clear inverted image of the window is formed on the screen. Measure the distance of the screen from the lens with a scale. This distance will be the focal length of convex lens.
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1View SolutionWhat is meant by:
- Principal focus of a convex mirror.
- Focal length of a convex mirror?
- 2View Solution“The magnification produced by a spherical mirror is - 3”. List four informations you obtain from this statement about the mirror/ image.
- 3View SolutionWhy do we prefer a convex mirror as a rear-view mirror in vehicles?
- 4View SolutionWhat type of lens is shown in the diagram on the right? What will happen to the parallel rays of light? Show by completing the ray diagram.
- 5View SolutionThe following table gives the refractive indices of a few media,
Use this table to give an example of:12345Medium:WaterCrown glassRock saltRubyDiamondRefractive index:1.331.521.541.712.42- A medium pair so that light speeds up when it goes from one of these medium to another.
- A medium pair so that light slows down when it goes from one of these medium to another.
- 6The absolute refractive indices of glass and water are $4 / 3$ and $3 / 2$ respectively. If the speed of light in glass is $2 \times 10^8$ $m / s$, calculate the speed of light in (i) vacuum, (ii) water.View Solution
- 7View SolutionDraw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed towards the principal focus of a convex. mirror. Mark on it the angle of incidence and the angle of reflection.
- 8View SolutionState two positions in which a concave mirror produces a magnified image of a given object. List two differences between the two images.
- 9View SolutionIt is desired to obtain an erect image of an object, using concave mirror of focal length of 12cm.
Will the image be smaller or larger than the object? Draw ray diagram to show the formation of image in this case. - 10View SolutionWhat is the position of image when an object is placed at a distance of 10cm from a convex lens of focal length 10cm?