Question

in concave mirror, if the height of image is 6cm, object distance is 25cm, focal length is 15cm, what is the size of object and what is the image distance? ​

Answer 1

Answer:

Given that f = -15 cm; u = -25 cm ; ho= 4 cm; v = ?

The mirror formula is 1/f = 1/u + 1/v = 1/-15 = 1/-25 + 1/v

1/v = 1/25 - 1/15

1/v = (3-5)/ 75 =-2/ 75

v =-37.5 cm

The screen should be placed 37.5 cm from the pole of mirror and the image is real.

Magnification, m = -v/u =hi/ho= hi / 4 = 37.5 / 25

hi = (37.5 / 25 )x 4 = -6 cm

So the image is enlarged and inverted

Step-by-step explanation:

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