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प्रश्न
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उत्तर
Four characteristics of light are:-
(a). Light waves can travel through a vacuum
(b). Light waves are transverse waves
(c). The wavelength of light waves is short so that their length is measured in cents-microns.
(d). The velocity of light in a vacuum is 3 x 108 m/s.
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संबंधित प्रश्न
Draw a neat two ray diagram to illustrate how a concave mirror is used as a shaving mirror.
Give two uses of concave mirror.
Identify the following kind of beam of light.
State whether the following statement is true or false. If false, correct it.
The image formed in a plane mirror is the real, erect, and same size as that of the object.
______Surface reflects the light well.
A light ray enters from medium A to medium B as shown in Figure 10.2. The refractive index of medium B relative to A will be
Suppose we wish to obtain the real image of a distant tree. Explain two possible ways in which we can do it.
Match the following:
| 1. | Rubber | a. | Erect |
| 2. | Greased paper | b. | Inverted |
| 3. | Real image | c. | Opaque medium |
| 4. | Virtual image | d. | Translucent medium |
Play with a mirror
Write your name with a sketch pen on a thin sheet of paper, polythene or glass. Read your name on the sheet while standing in front of a plane mirror. Now look at your image in the mirror.
