In an experiment to determine the focal length of a convex lens, a student obtained the image of a distant window on the screen. To determine the focal length of the lens, she should measure the distance between the _____.
None of these
lens and the window only
lens and screen only
screen and the window only
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To determine the focal length of the lens, she should measure the distance between the lens and screen only.
Explanation:
- The convex lens is a lens that converges rays of light that convey parallel to its principal axis which is relatively thick across the middle and thin at the lower and upper edges. The edges are curved outward rather than inward.
- A convex lens can converge a beam of parallel rays to a point on the other side of the lens. This point is called a focus of the lens and its distance from the Optical Center of the beam is called the focal length.
Image formed
- The distant window is assumed to be at infinity.
- And for an object at infinity, the image is formed at focus for convex lens.
- Now, here the screen will have the image, so it is considered to be at focus.
- So, the distance between lens and image gives the focal length of the lens.
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