Spherical mirror produces an image of magnification minus one on the screen placed at a distance of 40 cm from the mirror. The focal length and nature of the mirror is –
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(a) As magnification is in positive the image will be upright compared to the object and will form a Concave Mirror.
(b) The distance of image from the object is zero, real and inverted image of the same size is formed at the same place where object is placed.
(c) Spherical mirror has a radius of curvature R and a focal length i.e
F=
2
R
F=
2
50
F=25cm
(d) Figure attached shows the image formation by concave mirror for the given case.
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