Question

Suppose an object is placed u cm in front of a spherical mirror of focal length f such that the image is formed v cm from the mirror, then u, v and f are related by the equation; 1/f= 1/u + 1/v. This equation is referred to as the mirror formula. The formula holds for both concave and convex mirrors.​

Answer 1

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solution:-

u=30cm, f= 15cm, ho=4cm

1/v=1/f-1/u

= 1/15 – 1/30 =1/30

v =30cm

Also, m=v/u =hi/ho

Thus, hi=(30cm x 4cm)/30cm =4cm.

Thus the image formed is real and same size as the object.

When applying the mirror formula, it is necessary to observe the following points:

That all distances are measured from the mirror as the origin.

All real distances are positive while all virtual distances are negative.

A concave mirror has a positive focal length while a convex mirror has a negative focal length.

Answer 2

Explanation:

Thermodynamics is the branch of physics that deals with the relationships between heat and other forms of energy. ... Thermal energy is the energy a substance or system has due to its temperature, i.e., the energy of moving or vibrating molecules, according to the Energy Education website of the Texas Education Agency.