For this and the following 5 problems, use the information: an object is located

Question

For this and the following 5 problems, use the information: an object is located to the left of a thin lens, a distance +25.0 cm, and the image is magnified -0.44 times.

What type of lens is being used. Your answer must be in the form "C" for converging, or "D" for diverging".

Determine the focal length of the lens. Give your answer in the form "+/-a.bc" cm.

Determine the distance of the image from the lens Give your answer in the form "+/-ab.c" cm.

Is the image real or virtual?. Give your answer in the form "Real" or "Virtual".

Is the image inverted or not inverted relative to the object? Give the answer to in the form " Inverted" or "Not inverted".

Finally, is the image on the same side or opposite side of the lens as is the object? Give your answer in the form " Same" side or "Opposite" side.

Explanation / Answer

1. Since the magnification is negative means image is real, it must be a convex lens (concave form always virtual image)

2. For Lens ,

1/v - 1/u = 1/f and m = v/u

u = -25 cm ; so v = mu = -0.44*-25 = +11.0 cm (right)

1/f = 1/11 - (-1/25) => f = +7.64 cm

3. v = +11.0 cm

4. Real (m < 0)

5. Inverted (Real image are inverted)

6. Opposite (v is positive)

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