CBSE Class 11-science Answered

Ans 1. The parallax method is a way to measure distances by using the apparent shift of an object against a background as the observer moves. To measure the distance using the parallax method, the observer first finds the object and marks its position. The observer then moves to a different location and marks the object's new position. The distance between the two positions is then measured and used to calculate the distance to the object.

To put it simply, imagine you are standing at position A and you want to calculate the distance between you and an object at point C, as shown in the figure below.

Now, in the given case, we move to point B, which is perpendicular to point A and at distance AB from its initial position, thus we can find the distance AB and angle θ.

Using these we can calculate AC by using formula.

This is how we measure distance using parallax method. 

Note: Please elaborate the second question in detail, so that we can provide the solution for the same.