a mirror always forms virtual image of the magnification unity.the focal length of the mirror is
a.less than 1m but not zero
bgreater than 1m but not infifnity
c.1m
d.infinity
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9
Explanation:
Magnification produced by a convex mirror is always:
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A convex mirror always creates a virtual image which is diminished. So, magnification produced by convex mirror is always less than one.
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The focal length of the mirror is infinity (Option - d)
- The Mirror forms virtual images always.
- Magnification = 1 i.e. the size of the image is equal to the size of the object.
- Therefore, the mirror is a plane mirror according to the given characteristics.
- The object distance in front of the mirror and image distance behind the mirror is the same.
- Therefore, an image of an infinite object is also visible in the mirror.
- Hence, its focal length is infinite as the image can be formed at any distance behind the mirror as far as the object is in front of the mirror.
- A plane mirror has a plane, flat reflective surface.
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