when an object is placed infront of concave mirror at distance 30cm from an image us obtained on a screen at a distance of 20cm from the mirror find the focal length of the mirror
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object is placed infront of concave mirror at distance 30cm from an image us obtained on a screen at a distance of 20cm from the mirror find the focal length of the mirror
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The image obtained on the screen will be similar to object placed in front of concave mirror I.e 30cm
Explanation:
Object dostance be u, so u = +30cm and image obtained be v, so v = +30cm
let the focal length be the f
Focal length= 1/f = 1/U+1/v =1/30 +1/30 =1/15 or f=1/15
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