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Focal Length of Spherical Mirrors Video Lecture | Physics for JAMB

FAQs on Focal Length of Spherical Mirrors Video Lecture - Physics for JAMB

1. What is the focal length of a spherical mirror?

Ans. The focal length of a spherical mirror is the distance between the mirror and its focal point. It is denoted by the symbol "f" and is an important parameter that determines the properties of the mirror, such as its ability to converge or diverge light.

2. How is the focal length of a spherical mirror determined?

Ans. The focal length of a spherical mirror can be determined by measuring the radius of curvature of the mirror. The radius of curvature is the distance between the mirror's surface and its center of curvature. The focal length is then equal to half of the radius of curvature.

3. What is the difference between a concave and convex mirror in terms of focal length?

Ans. In terms of focal length, a concave mirror has a positive focal length, while a convex mirror has a negative focal length. A concave mirror converges light rays and has a real focal point, whereas a convex mirror diverges light rays and has a virtual focal point.

4. How does the focal length affect the image formed by a spherical mirror?

Ans. The focal length of a spherical mirror determines the size and position of the image formed. If the object is placed beyond the focal point of a concave mirror, a real and inverted image is formed. If the object is placed between the focal point and the mirror, a virtual and magnified image is formed. For convex mirrors, the image is always virtual, upright, and smaller than the object.

5. Can the focal length of a spherical mirror be changed?

Ans. No, the focal length of a spherical mirror is a fixed property determined by its curvature. It cannot be changed unless the mirror is physically altered. However, by using different mirrors with varying focal lengths, the desired optical effects can be achieved.

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Physics for JAMB

260 videos|253 docs|230 tests

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