Ans. Rainbow appears usually after the rain when the sun is low in the sky. The rainbow is seen as a large arc in the sky with many colours.
Ans. The surface of water can also act like a mirror and change the path of light. Thus, we see reflection of trees or buildings in water.
Ans. Concave and convex mirrors are called spherical mirror because their reflecting surfaces are the parts of hollow sphere of glass.
Ans. Concave mirrors are used by dentists to see an enlarged image of the teeth. Convex mirrors are used as side mirrors in vehicles.
Ans. The image formed is erect and is of the same size in stainless steel plate because it acts as a plane mirror.
Ans. A convex lens can form real and inverted image. When the object is placed very close to the lens, the image formed is virtual, erect and magnified.
Ans. Uses of convex mirror
i. They are used as side mirrors in vehicles.
ii. They are used in magnifying glass.
Ans. Yes, when we blow soap bubbles, they appear colourful. Similarly, when light is reflected from the surface of a Compact Disk (CD), we see many colours.
Ans. When the top is rotated fast, the colours get mixed together and the top appears to be whitish.
Ans. A concave mirror can form a real and inverted image. When the object is placed very close to the mirror, the image formed is virtual, erect and magnified.
Ans. The inner surface of a spoon acts like a concave mirror. Image is erect and larger in size. If we increase the distance of the spoon from our face, we may see our image inverted.
Ans. The image formed by a plane mirror is erect. It is virtual and is of the same size as the object. The image is at the same distance behind the mirror as the object is in front of it.
Ans. An image which cannot be obtained on a screen is called a virtual image. The image formed by a plane mirror is virtual image because it could not be obtained on a screen.
Ans. Sunlight consists of seven colours. The sunlight is said to be white light. This means that the white light consists of seven colours. These are red, orange, yellow, green, blue, indigo and violet.
Ans. Concave mirrors are used for many purposes. Doctors use concave mirrors for examining eyes, ears, nose and throat. Concave mirrors are also used by dentists to see an enlarged image of the teeth. The reflectors of torches, headlights of cars and scooters are concave in shape.
Ans. Obtaining the image of the sun on a paper with the help of a concave mirror burn the paper because concave mirror converge the sunrays to one point.
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