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प्रश्न
How can a concave mirror be used to obtain a virtual image of an object? Draw a diagram to illustrate your answer.
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उत्तर
A concave mirror forms a virtual image of an object when the object is placed between focus and mirror (pole)
A virtual, erect and bigger image is formed behind the mirror
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संबंधित प्रश्न
An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained? Find the size and the nature of the image.
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The diagram shows a dish antenna which is used to receive television signals from a satellite. The antenna (signal detector) is fixed in front of the curved dish.
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- Where should the antenna be positioned to receive the strongest possible signals?
- Explain what change you would expect in the signals if a larger dish was used.
A student has focused the image of a candle flame on a white screen using a concave mirror. The situation is as given below:
Length of the flame = 1.5 cm
Distance of flame from the mirror = 18 cm
If the flame is perpendicular to the principal axis of the mirror, then calculate the following:
- Distance of the image from the mirror
- Length of the image
If the distance between the mirror and the flame is reduced to 10 cm, then what would be observed on the screen? Draw ray diagram to justify your answer for this situation.
An object at a distance of 30 cm from a
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______ mirrors magnify the object placed close to them.
