Need Help With This Physics 3 Questions?

Question

a. An object is placed 4.0 m away from a thin converging lens of focal length +1.0 m. The image formed by the lens is A) inverted, larger than the object; B) inverted, smaller than the object; C) erect, the same size as the object; D) erect, larger than the object; E) inverted, the same size as the object.

b. An object is placed 2.0 m away from a thin converging lens of focal length +1.0 m. The image formed by the lens is A) erect, larger than the object; B) inverted, smaller than the object; C) inverted, the same size as the object; D) inverted, larger than the object; E) erect, smaller than the object.

c. An object is placed 1.5 m away from a thin converging lens of focal length +1.0 m. The image formed by the lens is A) inverted, larger than the object; B) erect, smaller than the object; C) erect, the same size as the object; D) inverted, the same size as the object; E) inverted, smaller than the object.

d. An object is placed 4.0 m away from a thin diverging lens of focal length -1.0 m. The image formed by the lens is A) erect, larger than the object; B) inverted, smaller than the object; C) inverted, the same size as the object; D) inverted, larger than the object; E) erect, smaller than the object.

Answer 1

I = O•f/(O-f) so I = 4/4-1 = 1.33m

magnification M = I/O so 1.33/4 = 0.33 since magnification is less than 1, the image is diminished.

Correct answer is B) inverted, smaller than the object

You can use the above method to help you solve the others or state them in separate questions.

Mr. A