A photographer moves closer to his subject and then

Solution 20Q:

        We have to determine the change in the position of the camera lens when the photographer moves closer to his subject and then refocuses.

Step 1 of 2

Concept:

Refraction: The phenomenon of bending of light as it passes obliquely from one transparent medium to another medium is called refraction of light.

When the light rays travel from denser to rarer medium, they bent away from the normal and when the light rays travel from rarer to denser medium, they bent towards the normal.

The point where the incident parallel rays come to a focus after refraction is called the focal point of the lens, which is fixed for the given lens.

        Distance of the object is measured by using the mirror equation, which is given as below:

                        …(1)

Here,    Distance of the object from the pole

 Distance of the image from the pole