問 1
1 点What happens to a parallel beam of light rays after passing through a convex lens?
Junior Secondary · Science
Images formed by convex 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 convex lenses」からの出題です。
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問 2
1 点An object is moved slowly towards a convex lens from a very far distance until it reaches the principal focus (\(F\)). Which of the following correctly describes the change in the real image formed on a screen?
問 3
1 点When constructing a ray diagram for a convex lens, a student draws a ray that originates from the top of the object and passes through the focal point \( F \) on the same side as the object before it hits the lens. How will this ray travel after passing through the lens?
問 4
1 点The distance between the optical centre of a convex lens and its focal point is called the:
問 5
1 点A convex lens has a focal length of \( 15\ \text{cm} \). If an object is placed at a distance of \( 40\ \text{cm} \) from the optical centre of the lens, what are the characteristics of the image formed?
問 6
2 点If a student successfully projects a clear image of a candle flame onto a white wall using a single convex lens, what are the two essential characteristics of this image?
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
3 点In a ray diagram for a convex lens, a light ray enters the lens parallel to the principal axis. Describe the path of this ray after it passes through the lens and explain why this occurs.
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A student uses a convex lens to view a small insect. As she moves the lens closer to the insect (within the focal length), describe the change in the size and position of the virtual image observed.
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
3 点A ray box is used to send light rays through a convex lens. Describe the behavior of the following three light rays:
(a) A ray that enters the lens parallel to the principal axis. (1 point)
(b) A ray that passes through the optical centre of the lens. (1 point)
(c) A ray that passes through the principal focus (\(F\)) before hitting the lens. (1 point)
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
4 点A convex lens is often used in instruments like projectors and cameras because of its ability to converge light rays and form real images. Consider a convex lens with a focal length (\(f\)) of \(5\text{ cm}\).
(a) If an object is placed \(12\text{ cm}\) away from the lens, describe the four main characteristics of the image formed (nature, position relative to \(F\) or \(2F\), orientation, and size relative to the object).(b) If the lens is used to project a sharp, real image of the object onto a screen, briefly explain, using the concept of light rays, why the image must be real to be visible on the screen.
(c) If the top half of this convex lens is covered completely with an opaque material, how will the brightness and completeness of the image formed on the screen change? Explain your reasoning.
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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