Question

a convex lensform a real and inverted image of aneedle at a distance of 50 CM. where the needle in front of con vex lens if the image is equal to the size of object​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

Given : object distance ( u) = - 50 cm

Image distance (v) = 50 cm

Focal length = f

Explanation:

According to the lens formula

u = -50 cm

v = 50 cm

f = ?

1/f = 1/v + 1/u

1/f = 1/50 + 1/50

f = 25 cm = 0.25 m

power of lens = 1/f = 1/0.25 = 4D