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Gurmit wanted to perform activity 16.8 u...

Gurmit wanted to perform activity 16.8 using a laser torch . Her teacher advised her not do so. Can you explain the basis of the teacher's advice?

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Gurmit wanted to perform activity 16.8 using a laser torch. Her teacher advised her not to do so.Can you explain the basis of the teacher 's advise ?

CAUTION: This activity needs the teacher's assistance. It would be better if students wear suitable eyeglasses. • Clean a magnesium ribbon, about 3-4 cm Tong by rubbing it with sand paper. Hold it with a pair of tongs. Burn it using a spirit lamp or a burner and collect the ash so formed in a watch glass as shown in Fig. Burn the magnesium ribbon keeping it away as far as possible from your eyes. What do you observe ?

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  1. Describe the construction of a Kaleiodeoscope.

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  2. Draw a labelled sketch of the human eye.

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  3. Gurmit wanted to perform activity 16.8 using a laser torch . Her teach...

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  4. Explain how can you take care of your eyes.

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  5. What is the angle of incidence of a ray if the reflected ray is at an ...

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  6. How many images of a candle will be formed if it placed between two pa...

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  7. Two mirrors meet at right angles. A ray of light is incident on one at...

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  8. Bhooja stands at A just on the side of a plane mirror as shown in figu...

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  9. Find out the position of image of an object situated at A in plane mir...

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  10. Find out the position of image of an object situated at A in plane mir...

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  11. Find out the position of image of an object situated at A in plane mir...

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  12. The plane and polished surface that returns lightr falling on it in th...

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  13. How many colours are present in white sunlight?

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  14. What is the most convenient distance for reading by a normal eye?

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  15. When you see in dim light the size of your pupil becomes:

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  16. The Phenomena of splitting of light into its constituent colours is ca...

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  17. The eye lenses focuses:

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  18. Can any one see in the dark?

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  19. To see an object-

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  20. Name any two Luminous bodies.

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