Answer:
D) Image cannot be seen
Explanation:
As we know by lens formula

now we know that
object is placed at the focal point of lens

so we will have

so the image will form at infinite
so image will be at infinite distance from the lens
so it cannot be seen
Answer:
19.5324 MPa
Explanation:
Information provided
Angle between the normal to the slip plane with tensile axis, 
Angle by slip direction with tensile axis,
Critical resolved shear stress,
Applied stress
Shear stress at slip plane
hence crystal won’t yield
Applied stress,
for crystal to yield is given by

Convention is known as one of the driving forces of atmospheric circulation. Convection is defined as the heat transfer due to bulk movement of the molecules within fluids like liquids and gases, uncluding th molten rock. Convention takes place through diffusion, advection or can be both and it is usually a domination form of heat that transfer into liquids and gases.
This would be an example of deposition (Phase transition).