Answer:
a. relative size
Explanation:
Relative size -
It refers to as the ability , that allows to find how far or close is the object , according to the size , is referred to as relative size .
This is a pure estimation , and hence can be false in some or the other way .
It is not the exact or genuine method , but is quite effective .
Human being uses this concept to find the size of moon , on comparing with some other heavy body , as the exact measurement of the size is near to impossible .
Hence , from the given scenario of the question,
The correct option is a. relative size .
Answer: Tom is using RELATIVE SIZE.
Explanation: Relative size can be defined as the interpretation that two identical objects at different distances will have different sizes according to the retina.
It enables an individual to determine how close objects are to an object of known size. Although this method is purely based on estimation and prone to errors. It is good for determining size in relation to some larger scale thing.
