The mass of the object is the answer of your question
Answer:
The object must be placed just ahead of focus towards the lens.
Explanation:
As we know that a magnifying glass is a convex lens and for the convex lens and for a convex lens we get the image virtual, erect and magnified only when it is placed between the optical center and the focus of the lens.
In that range when the object is nearest to the focus of the lens it has the maximum size.
So it can be possible if the object is placed at 9.98 cm from the optical center.
The largest image is formed at infinity when the object is placed at focus but it is not visible to the normal eyes.
If a mass m is attached to an ideal massless spring and has a period of t, then the period of the system when the mass is 2m is
.
Calculation:
Step-1:
It is given that a mass m is attached to an ideal massless spring and the period of the system is t. It is required to find the period when the mass is doubled.
The time it takes an object to complete one oscillation and return to its initial position is measured in terms of a period, or T.
It is known that the period is calculated as,

Here m is the mass of the object, and k is the spring constant.
Step-2:
Thus the period of the system with the first mass is,

The period of the system with the second mass is,

Then the period of the system with the second mass is
times more than the period of the system with the first mass.
Learn more about period of a spring-mass system here,
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It’s light seconds, now don’t mistake it as time