a short linear object of length 8cm lies on the axis of concave mirror 15 cm focal length a distance of 30 cm from the mirror. what is the size of the image
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Answer:
size of image is -8cm mean of same size but below principle axis
Explanation:
here f=15cm; h=8cm; u=30cm
here f is 15cm and u=30cm mean object is at center mean at 2f
1/f=1/u+1/v
1/15=1/30+1/v
1/v=1/15-1/30
1/v=2-1/30
1/v=1/30
v=30
since image is also formed at center.
hight of image is given by
h'/h=-v/u
h'/8=-30/30
h'/8=-1
h'=-8cm
mean image is of same size because it is at center as you see in image, here dotted and solid line show incident ray and reflected ray respectively.
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