a convex lens reduces an real and inverted image 2.5 times magnified at the dist...

Questions

August 2021 2 24 Report

a convex lens reduces an real and inverted image 2.5 times magnified at the distance of 25 centimetre from the lens. calculate the focal length of the lens

HridayAg0102

Verified answer

Hi.....

m = v/u

= - 2.5 = v/u

=> v = -2.5u

1/v + 1/u = 1/f

1/2.5u + 1/u = 1/f

= (1+ 2.5)/u = 1/ f

Now, we know that u = 25 cm

= (1 + 2.5)/ 25 = 1/f

Therefore, by solving the equation , we get

f = 3.5 / 25 cm

=> 0.14 cm........ANS

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