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प्रश्न
How do we see objects around us ?
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उत्तर
Objects are seen when light after striking them, returns in the same medium and reach our eyes.
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संबंधित प्रश्न
Write true or false of the following statement.
The moon is self-luminous.
Fill in the blank
Light consists of .............. colours.
Match the following
| Column A | Column B |
| 1. Transparent object | i. Football |
| 2. Eclipses | ii. Glass |
| 3. Translucent object | iii. Fluorescent tube |
| 4. Luminous object | iv. Tracing paper |
| 5. Non - luminous object | v. Shadows |
Answer the following.
What is meant by luminous intensity? What is one lumen?
Write whether of the following objects are luminous or non-luminous.
| Object | Luminous/Non-luminous |
| A book | |
| A burning candle | |
| A wax cloth | |
| A pencil | |
| A pen | |
| A light bulb | |
| A tyre | |
| A torch |
Match the following.
| Group A | Group B |
| (a) Mirror | (1) Non-luminous |
| (b) Firefly | (2) Inverted image |
| (c) Pinhole camera | (3) Reflection |
| (d) Moon | (4) Luminous |
Write about two everyday situations that tell you that light travels in a straight line.
Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli are, respectively
State whether the following statement is True or False.
An object can be seen only if it emits light
Look at the figure given in the following figure.
Will there be any difference in the shadow formed on the screen in A and B.
