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An object 4cm in size, is placed at 25cm infront of a concave mirror of focal length 15cm. At what distance from the mirror whould a screen be placed in order to obtain a sharp image?Find the nature and the size of the image.
Asked by amarapurevathi | 05 Oct, 2018, 12:22: PM
focal length = f = - 15 cm

object distance = u = -25 cm
image distance = v = ?
hi = ?
ho =  4 cm

Mirror formula,

1/v + 1/u = 1/f

Thus, to get image of object sharp it has to be placed at 37.5 cm

Size of image is 6 cm
As the height of object is more and negative, nature of image is real, inverted and magnified.
Answered by Shiwani Sawant | 05 Oct, 2018, 02:25: PM

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