An object is placed 10 cm in front of a spherical mirror. The image is formed at a distance of 30 cm to the other side of the mirror. Find the focal length and identify the type of mirror.
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Answer:
Ray optics
Explanation:
★ Given ;
» Object Distance ( U ) = -10 cm
» Image Distance ( V ) = + 30 cm ( other side of Mirror ; so +ve )
★ Focal Length ( f ) = .??
_________________________________________________________________________________
★ By Mirror Formula ★
1 / V + 1 / U = 1 / F
1 / +30 + 1 / ( -10 ) = 1 / F
1 - 3 / 30 = 1 / F [ by LCM ]
-2 / 30 = 1 / F
★ F = - 15 cm ★
≈ Negative focal length represents Concave Mirror ≈
Hope it helps you
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