Question

A concave mirror has a radius of curvature is 30 . If an object is placed at 20cm ,where is the image

Answer 1

Answer:

image will form beyond centre of curvature

real and inverted

large sized image

Answer 2

Answer:

Mirror formula: 1/v+ 1/u = 1/f

f= R/2 = 30/2 = 15

u= 20cm

1/ -20 + 1/ v = 1/ -15

1/v = 1/-15 - 1/20

1/v = 1/60

v = 60 cm

Thus the image is 60 cm in front of the mirror

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