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Light Reflection and Refraction
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02/12/2020 10:58 am
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An object 2 cm high is placed at a distance of 64 cm from a white screen. On placing a convex lens at a distance of 32 cm from the object it is found that a distinct image of the object is formed on the screen. What is the focal length of the convex lens and size of the image formed on the screen? Draw a ray diagram to show the formation of the image in this position of the object with respect to the lens.
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02/12/2020 11:01 am
Since, object-screen distance is double of object-lens separation, the object is at a distance of 2f from the lens and the image should be of the same size of the object.
So, 2f = 32 ⇒ f = 16 cm
Height of image = Height of object = 2 cm