A student investigated how the magnification produced by a convex lens varies with the distance(d) between the object and the lens.The student used the apparatus shown in Figure 1.Figure 13.(a) The student measured the magnification produced by the lens by measuring the imageheight in centimetres.Explain why the image height in centimetres was the same as the magnification.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(2)Page 5 of 51Waves (F)
Question
A student investigated how the magnification produced by a convex lens varies with the distance(d) between the object and the lens.The student used the apparatus shown in Figure 1.Figure 13.(a) The student measured the magnification produced by the lens by measuring the imageheight in centimetres.Explain why the image height in centimetres was the same as the magnification.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(2)Page 5 of 51Waves (F)
Solution
In a lens magnification experiment, the magnification is defined as the ratio of the image height to the object height. If the object height is set as 1 cm (or any standard unit), then the image height directly gives the magnification.
For example, if the object height is 1 cm and the image height is 3 cm, the magnification is 3 (3 cm / 1 cm). This is why the student could measure the magnification by simply measuring the image height in centimeters.
This method assumes that the object height is constant and known. If the object height changes or is unknown, then the image height alone would not give the magnification. In such cases, both the object height and image height would need to be measured.
Similar Questions
A convex lens has a focal length of 15 cm. When an object AB is kept at x distance from the lens, then the image formed has magnification +3 but when the object is further displaced by y distance away from the lens as shown in the figure then image formed has magnification –3. ThenOne/More correct answer(s)A.Value of x is 7.5 cmB.Value of y is 10 cmC.Value of x is 10 cmD.Value of y is 20 cm
(a) A lens of focal length 5 cm is being used by Debashree in the laboratory as amagnifying glass. Her least distance of distinct vision is 25 cm.(i) What is the magnification obtained by using the glass
A student's microscope has an ocular lens with a 10x magnification. Calculate the total magnification, if the objective lens is set to 30x.
A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find the magnification of the image formed.
An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens upto two places of decimal.
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.