Question

a concave lens forms a real n inverted image of a needle at a distance of 50cm fron it. where is the neddle placed in front ofthe convex lens if the image is eqal to the size of the object? also, find the power of the lens.​

Answer 1

Answer:

The object is placed at $2F_{1}$ of the lens

The Power is 4D

Explanation:

Since hi = ho

         m = 1

Therefore the object is placed at $2F_{1}$

2f = 50cm      [Proved]

f = 25cm = 0.25m

P = 1/f    [in meters]

P  = 1/0.25

P = 100/25

P = 4D

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Answer 2

The position of the image should be at 2F since the image is the real and same size.

It is given that the image of the needle is formed at a distance of 50 cm from the convex lens. Therefore, the needle is placed in front of the lens at a distance of 50 cm.