what happens to the focal length of a mirror when it is immersed in water?
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Accepted Answer: The focal length of the concave mirror does not change when it is immersed in water because focal length of a mirror does not depend upon the refractive index of the medium. ... Therefore, when a convex lens is dipped into water, its focal length increases.
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The closer the object to the focal pointis, the higher is the magnification rate. If the object is placed 2X of the focal length, then the object and the real image will have the same size. If the objet´s distance is farther than 2X-focal lenth, then the real image becomes demagnified – is smaller than the object.
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Focal length is a well known word in optical physics. Focal length is distance over which the parallel rays either converge or diverge. For convex lens the focal length is positive. On the other hand, the focal length of concave lens is negative.
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Answer Expert Verified focal length depends upon refractive index of lens with respect to medium. hence, after immersing of lens in water focal length of lens increases.
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The focal length ( f ) is the distance from a lens or mirror to the focal point ( F ). This is the distance from a lens or mirror at which parallel light rays will meet. (right) a concave mirror. Note that a lens has a focal point on both sides of the lens axis.
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As the object distance approaches one focal length, the image distance and image height approaches infinity. Finally, when the object distance is equal to exactly one focal length, there is no image.
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According to the Cartesian sign convention, the focal length should be positive since the convex mirror forms a virtual image to the right of mirror (positive direction) when light comes from left.
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As we know that the focal length of a spherical mirror is equal to half the radius of curvature of that mirror. So, according to your question the radius of curvature of a convex mirror is 32cm. 16 cm. So the focal length of the convex mirror is 16cm.
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Answer: "Focal length is positive" is one of the option that doesn't apply for the concave mirror. Explanation: The focal length is negative for a concave mirror since according to the Cartesian Sign, the object is placed "in front of the mirror" and the sign of the object is taken as 'negative'.
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For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a converging lens (for example a convex lens), the focal length is positive, and is the distance at which a beam of collimated light will be focused to a single spot.
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The focal length is f = 1/P = 3R/2; this is the distance of the focal planes out from the centre of the sphere, which is R/2 in front of and behind it. This can be checked directly.
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It does not say the NATURE of the image. Since the mirror is concave; the image could be REAL or VIRTUAL. To play it safe; we must provide TWO solutions: Solution I: using the mirror formula: 1/30 = 1/Do + 1/3 Do → Do = 40 cm.
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the focal length of a concave mirror is 30cm, find the position of the object in front of the mirror so that the size of the image is three times the size of the object..
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Focal length (shown in red) is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.
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The minimum distance between an object and its real image in the case of a concave mirror is Zero. When the object is at the 2F distance i.e. the center of curvature, then the image is real and formed inverted at the same distance.
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The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted(a) 75 cm(b) 72 cm(c) 63 cm (d) 50 cm.
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Light rays from infinity, parallel to the principal axis, thus meet at the a point on the principal axis on the side of the mirror which is towards the object. This distance is considered as negative since it is on the side of the object. Hence the focal length of a concave mirror is negative.