The value of the object distance at which the lens will act as a simple microscope is 25 cm.
<h3>What is the least distance of distinct vision?</h3>
The least distance of distinct vision is the smallest distance someone with "normal" vision can comfortably look at something.
The least distance of distinct vision of a microscope is 25 cm.
When the object is placed at focal length of 15 cm, a virtual, erect and magnified image will be formed at near point (D = 25 cm) from the eye.
Thus, the value of the object distance at which the lens will act as a simple microscope is 25 cm.
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The formula for kinetic energy is,
where m is mass and v is velocity.
Let's plug the given values in the formula.
It's kinetic energy is 64 Joules.
If the sign of work is negative, that means the force and the motion are in opposite directions.
Let's say you see something roll off of the shelf. You catch it, and you let it down slowly and gently.
Gravity exerted down-force on it and it moved down. Gravity did positive work on it.
YOU exerted UP-force on it and it moved down. YOU did negative work on it.
(Also, the falling object exerted down-force on your hand, and your hand moved down. The falling object did positive work on your hand ! Where did THAT energy come from ? It came from the potential energy that the object had while it was on the shelf. Your hand absorbed that energy on the way down, doing negative work. So the object didn't have any kinetic energy when it reached the floor, and it did NOT splinter the floor or shatter in smithereens. It had barely enough energy left to make a sound when it hit the floor.)
The correct answer is C.N204