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प्रश्न
Suppose we wish to obtain the real image of a distant tree. Explain two possible ways in which we can do it.
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उत्तर
Two possible ways in which the real image of a distant tree can be obtained are given below:
- By using a concave mirror and a screen. In a concave mirror, a real image is formed if the distance between the mirror and the object is beyond the focus.
- By using a convex lens and a screen. In a convex lens, when the object is far away from the lens, the image is very close to the lens, real and inverted.
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संबंधित प्रश्न
State four characteristics of the image formed by a plane mirror.
Draw a figure describing the following.
The reflecting surface of two mirrors make an angle of 90∘ with each other. If a ray incident of one mirror has an angle of incidents of 30∘, draw the ray reflected from the second mirror. What will be its angle of reflection?
Draw diagrams to show the difference between regular and irregular reflection.
A converging mirror, forms three times magnified virtual image when an object is placed at a distance of 8 cm from it. Calculate:
- the position of the image
- the focal length of the mirror.
Copy the figure. By taking two rays from point A, show the formation of image. State four characteristics of the image.
The angle between an incident ray and the mirror is 350.
(i) What is the angle of incidence?
(ii) What is the angle of reflection?
(iii) What is the total angle turned by the ray of light?
(iv) What is the angle between the incident and the reflected rays?
A burning candle in water
Take a shoe box, open on one side. Place a small lighted candle in it. Place a clear glass sheet (roughly 25 cm × 25 cm) in front of this candle figure. Try to locate the image of the candle behind the glass sheet. Place a glass of water at its position. Ask your friends to look at the image of the candle through the sheet of glass. Ensure that candle is not visible to your friends. Your friends will be surprised to see the candle burning in water. Try to explain the reason.
