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Using mirror formula, explain why does a...

Using mirror formula, explain why does a convex mirror always produce a virtual image.

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`1/v + 1/u = 1/f`
Using sign convention for convex mirror we get
f > u < 0
`therefore `From the formula ` 1/v = 1/f - 1/u`
As f is positive and u is negative, v is always positive, hence image is always virtual.
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Knowledge Check

  • A luminous object is placed 20 cm from surface of a convex mirror and a plane mirror is set so that virtual images formed in two mirrors coincide. If plane mirror is at a distance of 12cm from object. Then focal length of convex

    A
    5cm
    B
    10cm
    C
    20cm
    D
    40cm

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