An object 3 cm high produces a real image 4-5 cm high, when placed at a distance of 20 cm from a concave mirror. Calculate : (i) the position of image (ii) focal length of the concavemirror.

An object 3 cm high produces a real image 4-5 cm high, when placed at

1.	An object 3 cm high produces a real image 4-5 cm high, when placed at a distance of 20 cm from a concave mirror. Calculate : (i) the position of image (ii) focal length of the concavemirror.
Answer» -Here,object HEIGHT, h1 = 3 cmimage height, h2 = 4.5 cmwe KNOW that,m = h2 / h1 = - V / uSo,4.5/3=-v /-20 (object distance =20)4.5 (-20/3) = - vv= 30 cmSo, image is 30 cm from the mirror.Now , using mirror formula1/U+1/v=1/f1/-20+1/-30=1/f-5/60=1/f-1/12=1/ff=-12Hence , the required focal length is 12 cm.HOPE IT HELPS YOU.PLZ, MARK ME AS A BRAINLIEST AND GIVE ME THANKS.GOOD BYESEE U AGAIN

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An object 3 cm high produces a real image 4-5 cm high, when placed at a distance of 20 cm from a concave mirror. Calculate : (i) the position of image (ii) focal length of the concavemirror.​

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An object 3 cm high produces a real image 4-5 cm high, when placed at a distance of 20 cm from a concave mirror. Calculate : (i) the position of image (ii) focal length of the concavemirror.