Q17 of 29 Page 109

Place an object on the table. Look at the object through the transparent glass slab. You will observe that it will appear closer to you. Draw a ray diagram to show the passage of light ray in this situation. (AS5)

When the object is looked through the transparent glass the object seems to rise or appears closer to us because of refraction. The Ray diagram is shown in the figure.



When the Ray of light goes from the denser medium (glass) to rare medium (air) it bends away from the normal and the object (O) appears close to us.


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15

Take a thin thermal sheet. Cut it in circular discs of different radii like 2cm, 3cm, 4cm, 4.5cm. 5cm etc ad mark centers with sketch pen. Now take needles of length nearly firm. Pin a needle to each disc at its centre vertically. Take water in a large opaque tray and place the disc with 2cm radius in such a way that the raw& is inside the water ac shown in fig Q15. Now try to view the free end (head) of the needle from surface of the water.


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 16

Explain the refraction of light through a glass slab with a neat ray diagram. (AS5)

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How do you appreciate the role of Fermat principle in drawing ray diagrams. (AS6)