Question

# An object is placed at a distance of 20 cm from a concave mirror of radius of curvature 0.6 m. Which of the following statement is incorrect?The image is formed at a distance of 60 cm from the mirror.The image formed is real.Magnitude of image distance = 3times of magnitude of object distance.The image formed is upside down.

Solution

## The correct option is B The image formed is real.Given : Radius of curvature R = 0.6 m = 60 cm Let f be the focal length We know that f=R2 f=30 cm For a concave mirror, focal length is taken as negative i.e f=−30 cm So, formed image is virtual. As Object distance u=−20 cm Let v be the image distance Using mirror formula, 1f = 1v + 1u 1-30 = 1v + 1-20 ⇒1v=1-30 + 120 ⇒v=60cm Positive sign of v indicates that image is virtual and as both u and v are with same sign, so, the image will be erect.

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