12. What is the net force on a 1-kg apple held at rest in your hand?
1 answer:
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Answer:
Its focal length is positive
Explanation:
A concave mirror is shown in attached figure. The distance from the pole to the focus of the mirror is called its focal length. Spherical mirrors are a part of a sphere.
As per conventions, we know that the axis opposite to x axis is taken as negative.
So, it is clear that the focal length of spherical concave mirror is negative.
Hence, the incorrect option is (c) " its focal length is positive".
The fact that, in general, liquids and gases expand when heated gives rise to
b) convection currents in fluids due to changing densities.