Q28 of 284 Page 220

Explain why, a stick half immersed in water appears to be bent at the surface. Draw a labeled diagram to illustrate your answer.

A straight stick which is immersed partly in water always looks to be bent at the surface of water, because the light coming from the stick bends when it comes out at the surface due to refraction of light.


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26

Draw a labeled ray diagram to show how a ray of light passes through a parallel sided glass block

(a) If it hits the glass block at 90° (that is, perpendicular to the glass block)


(b) If it hits the glass block at an angle other than 90° (that is, obliquely to the glass block).

 27

When a light ray passes from air into glass, what happens to its speed? Draw a diagram to show which way the ray of light bends.

 28

A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. Name the phenomenon responsible for this effect.

 29

With the help of a labeled diagram, explain why a tank full of water appears less deep than it actually is.