Lenses – Flashcards
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A converging lens?
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Is thicker in the center than at the edges, refracts parallel rays of light, will converge parallel rays into light, will bend parallel rays of light so they cross at a single point.
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An image of a distant object formed by a single converging lens?
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Is upside down, can be projected on a wall, can be focused on a screen, is real.
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An image formed by a single diverging lens?
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Is virtual.
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A magnifying glass is usually a?
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Converging lens.
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Ray diagrams are used to?
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Figure out where an image will be located.
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In drawing a ray diagram, one of the rays can be drawn?
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Through the center of the lens, from the tip of the object arrow, parallel to the axis, throug the focal point in front of the lens.
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If an object is located between the focal point and a converging lens, the image will be?
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Larger than the object.
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The reason lines on the bottom of a swimming pool can look wavy when seen from above?
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The uneven surface of the water refracts light at different angles.
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If an object is located inside the focal length of a diverging lens, then compared to the object image will be?
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Smaller.
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If an object is located inside the focal length of a converging lens, the image will be?
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Right-side up.
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All lenses rely on light having a?
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Slower speed in the lenses.
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A simple astronomical telescope consists of?
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A pair of converging lenses.
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The objective lens in a compound microscope forms a?
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Real image.
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The eyepiece of a compound microscope forms a?
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Virtual image.
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When slides are out right-side up into a slide projector, the images are?
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Upside down.
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If light traveled at the same speed in glass as it does in air, images through a telescope would look?
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The same as they would without the telescope.
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The image your eye receives is?
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Upside down.
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On a bright day, the iris of the eye changes so the pupil?
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Becomes smaller.
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If a persons eye cannot form sharp images at any distance, the person?
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Has astigmatism.
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Sometimes after light passes through a lens, they are tiny bands of color around the edge of the image. This is due to?
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Chromatic aberration.
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The eyes of nearsighted people focus light?
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In front of the retina.
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Farsighted people need to wear glasses that contain?
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Converging lenses.
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Spherical aberration occurs when light passes through?
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The edges of a lens.
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Chromatic aberration occurs because different colored light rays?
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Refract at different angles when passing through a lens.
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A magnifying glass under water will magnify?
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Less.
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The way bright and dark lines at the bottom of a swimming pool are the result of the water surface behaving like moving?
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Lenses.
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If a fish out of water wished to clearly view its surroundings, it should wear googles filled?
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Water.
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Suppose you are 2 m in front of a plane mirror and want to take your picture. For what distant should you set the camera?
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4 m
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A lens for which parallel rays of light meet after passing through it is called a converging lens.
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True
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The principal axis of a lens is a line drawn from top to bottom along the center of the lens.
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False
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The focal point of a lens is the place where rays of light falling on the lens cross or appear to have crossed the principal axis.
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False
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A real image can be projected onto a screen.
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True
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A ray diagram is a sketch of selected rays reflected from a surface or refracted through a lens.
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True
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A telescope is a collection of lenses that allows us to look at very distant objects.
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True
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A projector is the part of a camera that focuses light on the film.
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False
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The eye contains a converging lens that focuses light.
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True
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The amount of light that enters the eye is regulated by the iris.
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True
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Nearsighted people can clearly see objects that are close to them.
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True
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Astigmatism is remedied by glasses that have converging lense in them.
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False
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The point on the principal axis at which parallel rays of light cross after passing through a convergent lens is the focal point.
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True
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A real image formed by a single converging lens is always upside down a single diverging lens will produce an image that is always virtual, smaller, and right side up.
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True
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Light entering the eye focuses on a layer of light sensitive tissue at the back of the eye called the retina.
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True
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If a person is farsighted, his or her eye forms images in front of the retina.
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False
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A nearsighted person needs to wear glasses that have covering lenses in them
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False
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Which instrument is a human eye most similar to?
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Camera
