Question

Draw a thick straight line in ink, over a sheet of white paper placed
Place a glass slab over the line in such a way that one of its edges
- Look at the portion of the line under the slab from the sides. What
light.
Activity 10.9
, a
on a Table.
makes an angle with the line.
do you observe? Does the line under the glass slab appear to be
bent at the edges?
* Next, place the glass slab such that it is normal to the line. What
do you observe now? Does the part of the line under the glass slab
appear bent?
Look at the line from the top of the glass slab. Does the part of the
line, beneath the slab, appear to be raised? Why does this happen?





can anyone answer the questions and pls give explanation and observations ,imp points regarding this activity.... tq​

Answer 1

Answer:

When the a glass slab is placed over the line in such a way that one of its edges makes an angle with the line, then the line appears to be bent due to refraction of light. As light enters from the rarer medium(air) to the denser medium(glass), it is deviated from its path. Therefore the line appears to be bent. But when the glass slab is placed in such a way that it is normal to the line, then no bet can be observed as the incident ray falls normally(perpendicularly) to the surface of the glass slab and no bending of light takes place and it goes straight.

Answer 2

The experiment illustrates refraction property of light.

Explanation:

• When a light ray travels from one medium to another, the speed of light changes because of different densities of the medium. So, light ray bends due to this phenomena called refraction of light.
• When the glass slab is kept on an inked straight line, it appears to be bent because speed of light decreases in glass medium because density of glass is greater than density of air.
• When the line makes an angle other than $90^{o}$ with the glass slab, it appears to be bent towards the normal.
• Normal is the line drawn perpendicular to interface between the two mediums.
• When the glass slab is kept in such a manner that the line comes on the normal, then the light does not bend, as the light will not undergo refraction when incident ray is on normal.