Sun rays falling on a spherical mirror converges to a point at a distance of 10 centimetre from the pole of the mirror. Is this convex or concave? this mirror is then used to obtain an image of a shining pin placed perpendicular to the principal axis of the mirror .A sharp inverted image of the pin is formed on a small cardboard screen placed at a distance of 30 cm in front of the mirror. The size of the image is 6 . What is the size and position of the pin
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the mirror is converging ( concave)....
focal length of mirror= 10cm
u=?
v=30cm
1/f=1/v+1/u
1/-10=1/-30+1/u
1/u=1-3/30
u= -15cm....
m=-v/u=hi/ho
-30/15=6/ho
ho=3 cm....
height of object= 3 cm....
position of pin =15 cm from pole....( between focus and center of curvature)......
Explanation:
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