Answer:
Phase contrast microscope
Explanation:
It is used for viewing biological structures not visible under the microscope. It is used for viewing microrganisms live
silicone rubber is used to make a cast of a tool mark.
Answer:
The value of the final velocity is 
Explanation:
Generally from kinematic equation

Here a is the acceleration which is equivalent to g
So

substituting 6 m for s , 4.2m/s for u


Explanation:
<h3>The beam balance is a device used</h3><h3> for the determination of the mass of </h3><h3>a body under gravitation. It consists </h3><h3>of a beam supported at the centre </h3><h3>by an agate knife edge resting on a</h3><h3> support moving inside a vertical </h3><h3>pillar. The beam carries a light</h3><h3>pointer which moves over a scale.</h3>