Give one word for the following.
1. A mirror whose reflecting surface is the inner surface of a sphere?
2 A lens that is thicker at the edges than at the middle?
3. An image that is upside down?
4.A band of colours that is formed when white light is passed through
a prism?
5.The property of our eyes that makes us perceive a rotating coloured disc as white?
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Answers
Answer:
1.Concave mirror is a part of spherical mirror whose inner hollow surface is a reflecting surface.
2.A concave lens is thicker at the edges than it is in the middle. This causes rays of light to diverge. The light forms a virtual image that is right-side up and smaller than the object. A convex lens is thicker in the middle than at the edges
3.When the magnifying lens is close to the page, you see what is known as a virtual image. This is an upright image that is larger than the image on the page. As you move the magnifying lens closer to your eye and away from the page, you see what is called a real image, which is upside down.
4.Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet. The separation of visible light into its different colors is known as dispersion
5.Persistence of vision traditionally refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye
Explanation:
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Answer:
1. concave
2.convex lens
3.virtual image
4.spectrum
5.persistence of vision