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Spherical Mirrors

It is found t...

Question

It is found that as an object is moved from a great distance to the focus of a spherical mirror, the image moves away from the mirror. What kind of mirror is it—convex or concave?

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Solution

It is a concave mirror. The image formed by a concave mirror starts shifting away from the focus when the object is brought nearby the focus.

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Q. Assertion: In case of a concave mirror, if a point object is moving towards the mirror till focus along its principal axis, then its image will move away from the mirror.
Reason: In case of reflection

(

along the principal axis of mirror

)

, object and image always travel in opposite directions.
Consider the spherical mirror to be stationary and choose the correct option.

Q. (a) An object is placed just outside the principal focus of concave mirror. Draw a ray diagram to show how the image is formed, and describe its size, position and nature.
(b) If the object is moved further away from the mirror, what changes are there in the position and size of the image?
(c) An object is 24 cm away from a concave mirror and its image is 16 cm from the mirror. Find the focal length and radius of curvature of the mirror, and the magnification of the image.

Q. With a concave mirror, an object is placed at a distance

x_{1}

from the principal focus away from the mirror, on the principal axis. The image is formed at a distance

x_{2}

from the principal focus also away from the mirror. The focal length of the mirror is

Q. The distance between an object placed beyond center of curvature of a concave mirror and its image is d. If we move the object away from the mirror, the distance between object and image will

Q. A spherical mirror forms image of the same size when an object is placed at a distance of 8 cm or 16 cm from the mirror. Find the radius of curvature of the mirror. Is the mirror concave or convex?

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