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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
A converging mirror forms a real image of height 4 cm of an object of height 1 cm placed 20 cm away from the mirror:
- Calculate the image distance.
- What is the focal length of the mirror?
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.
Figure
(a) What is the purpose of the dish?
(b) Should it be concave or convex?
(c) Where should the antenna be positioned to receive the strongest possible signals?
(d) Explain what change you would expect in the signals if a larger dish was used.
Draw and complete the following diagrams to show what happens to the beams of light as they enter the glass block and then leave it:
If the radius of curvature of a concave mirror is 20 cm, its focal length is:
State two uses of a concave mirror.
Under which of the following conditions a concave mirror can form an image larger than the actual object?
A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by ______.
Examine the above figure and state which of the following option is correct? [one small box in the figure is equal to 1 cm]
______ mirrors make things look larger when objects are placed close to them.
Which type of mirror is used in the following?
Head lamps of a car
