When an object is kept at a distance 20 cm in front of a concave mirror, a real image is formed at the centre of curvature of the mirroe. Magnification produced by the mirroe is ______________ .
-1
The correct answer is Option 3 i.e. -1.
Explanation:
Given:
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Object distance (u) = –20 cm (negative as it's in front of the mirror)
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Image is formed at the centre of curvature, so Image distance (v) = –20 cm (Real image formed on the same side as the object, so it’s negative)
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Magnification (M) for a mirror is given by:
M=v/u
Substitute the values:
M=−20/−20 = +1
But for a real image formed by a concave mirror, the image is inverted, so the magnification is negative:
M =−1
Other options explained:
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–20: would imply the image is 20 times larger, which isn’t the case here.
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–10: not matching the actual image and object distances.
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–0.5: would mean the image is smaller than the object.
Similar Questions
- If an object is placed between infinity and the pole (P) in front of a convex mirror, what type of image will be formed?
- A concave mirror produces three times magnified (enlarged) real image of object placed at 10 cm in front of it. Which option describes the image correctly?
- Which of the following mirrors is used by doctors to focus a parallel beam of light on the patient's organs like teeth for the examination?
- The radius of curvature of a spherical mirror is 20 cm. Its focal length is:
- The nature of the image formed by a concave mirror if the magnification produced by the mirror is +3 is:
Important Questions from Mirrors and Images
Which one of the following telescopes contains only mirrors?
The correct relation between the radius of curvature R and focal length f of a spherical mirror is
Spherical mirror formula relating an object distance ‘u’, image distance ‘v’ and focal length of mirror ‘f’ may be applied to a plane mirror when
The image of an object formed by a plane mirror is
The image we see in plane mirror is
