A convex lens produce a real and inverted image 2.5 times magnified at a distance of 25cm from the lens calculate a focal length and power of lens
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Explanation:
★ Magnification (m) = + 2.5
★ Image distance ( v ) = 25 cm
» We know that
→ Magnification = + V / U
→ U = V / 2.5
→→ U = 25 / 2.5 = 10cm
★ OBJECT DISTANCE = (-) 10cm
★ By Lens Formula :
» 1/ V - 1/ (-U) = 1/F
» 1 / 25 - 1 / (-10) = 1/F
» 1/25 + 1/10 = 1/F
» 10 + 25 / 250 = 1/ F
» F = 250 / 35 = 7.14 cm
ANSWER :- FOCAL LENGTH OF LENS IS 7.14 CENTIMETERS
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