an object 4 cm in size is placed at 30 cm in front of a concave mirror of focal length 20 cm . at what distance from the mirror should a screen be placed in order to obtain a sharp image. find the nature and size of image.
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as focal length is 20 cm and object is placed at 30 cm so it is between c and f hence image will be formed beyond c .
screen should be placed beyond c or at a distance of 55-60 cm
image will be larger, real and inverted
screen should be placed beyond c or at a distance of 55-60 cm
image will be larger, real and inverted
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