Question

Explain reflection of light with the help of an activity.

Answer 1

Explanation:

let's understand refraction of light with the help of an activity

Activity 1

Take a glass. fill it with water and put a pencil in such a way that it is partly immersed and held obliquely to the surface.It appears to be bent at the point (at the upper surface of water level) where it enter water. It due to refraction of light. The light ray coming from the immersed portion of pencil bends and moves away from normal to the water surface. That is why the pencil partly immersed in Water appears to be bent at the water surface.

Activity 2

Take a white paper sheet and fix it on drawing board with drawing pins. Put a rectangular glass slab at the middle of the sheet. Draw the perimeter of rectangular glass slab with pencil. Mark PQRS on it and remove the slab. Now, draw normal MON at point O and draw a line AB making an angle (30o) with the normal with the help of protector. Insert two pins vertically at point A And B as show in fig.14.1

Now, put again the glass slab on same perimeter PQRS and see from the opposite face of glass slab the images pins A andB. Now put another pin C with viewing the pin A and B in such a way that image of C is also from on straight line on which image of pins A and B formed. put one more pin D in similar fashion so that pin D and C and pins A and B are on same straight line. Remove all the pins and glass slab. Denote a mark on the position of pin D and C and draw a line CD and extend it to a point O. Draw the normal ON at point O on the surface SR.

Now, join the point O and O and extend the line AB also the fig with dotted line.

You see that light moves along the line AB in air and enters into glass slab after striking on glass surface. At point O, the light AB in air (rarer medium) bends towards the normal during entrance in glass ( denser medium).

Similarly, at point O on the surface SR, the light ray from glass (denser medium) comes out in air (rarer medium) then it bends away from normal.

when a light ray passes from one medium to another medium then it deviates from it's original path. This phenomenon is called refraction of light.

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Answer 2

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↔ Reflection  is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves.