問 1
1 点If an object is placed at a distance of \(2F\) from a concave lens, where \(F\) is the focal length, how does the size of the image compare to the object?
Junior Secondary · Science
Images formed by concave lenses ：練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 5 問。すべて「Images formed by concave lenses 」からの出題です。
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問 2
1 点Door viewers (security peepholes) often use concave lenses. Which property of the image formed by a concave lens makes it useful for this purpose?
問 3
1 点A person with myopia (short-sightedness) uses spectacles with concave lenses. If this person removes their spectacles and looks at a distant object, which statement correctly describes the type of image formed by their eye's lens system on the retina?
問 4
1 点Which of the following is a common characteristic of all images formed by a single concave lens when viewing a real object?
問 5
1 点A convex lens and a concave lens both have the same numerical focal length of \(10\text{ cm}\). If an object is placed \(5\text{ cm}\) away from each lens, what is a common characteristic of the images formed by both lenses?
問 6
2 点State the orientation and nature (real or virtual) of an image formed by a concave lens when a real object is placed in front of it.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 7
4 点Between which two specific points on the principal axis is the image always located when a real object is placed at any distance in front of a concave lens?
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 8
5 点Explain how the diverging property of a concave lens makes it suitable for use in a security door viewer (peephole) to identify visitors.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 9
4 点A student is investigating the properties of different lenses. He places an object very close to a lens, at a distance less than the focal length (\(u < f\)).
(a) If the lens is a concave lens, state the three main characteristics of the image formed.(b) If the lens is a convex lens, state the three main characteristics of the image formed.
(c) State one similarity and one difference between the images formed by these two lenses in this specific setup.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 10
8 点A student uses a concave lens to study the properties of light divergence. She places a small object of height 2 cm at various distances from the lens, which has a focal length of 10 cm.
(a) If the object is placed 15 cm from the optical centre, describe the nature, orientation, and relative size of the image formed. (3 points)(b) The student then moves the object closer to the lens, to a distance of 5 cm. Will the image size increase, decrease, or stay the same compared to the image formed in part (a)? Justify your answer based on the movement of the image relative to the lens. (3 points)
(c) Explain why it is impossible for a single concave lens to create a magnified image of a real object, regardless of the object's position. (2 points)
まず自分で答えを書いてから、解説と照らし合わせましょう。
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