Q10 of 123 Page 410

Suppose you are inside the water in a swimming pool near an edge. A friend is standing on the edge. Do you find your friend taller or shorter than his usual height?

we know that,

But, here first surface is air, so and also, surface is not at all curved. So, .


So, formula reduced to,


So,


Here we know, of water. So, . Hence he will seem taller.



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8

In motor vehicles, a convex mirror is attached near the driver’s seat to give him the view of the traffic behind. What is the special function of this convex mirror which a plane mirror cannot do?

 9

If an object far away from a convex mirror moves towards the mirror, the image also moves. Does it move faster, slower or at the same speed as compared to the object?

 11

The equation of refraction at a spherical surface is


Taking, show that this equation leads to the equation



for refraction at a plane surface.


 12

A thin converging lens is formed with one surface convex and the other plane. Does the position of image depend on whether the convex surface or the plane surface faces the object?