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Sia ? 6 years, 6 months ago
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Gaurav Seth 6 years, 6 months ago
During sunrise, when the sun is just below the horizon, our atmosphere causes the light rays to bend and we see the sun early. Similarly, at sunset, the apparent position of the sun is visible to us and not the actual position due to the same bending of light rays effect.
To sum up, due to refraction we see the sun rise about two minutes before it’s actually there and during sunset we see it for around two minutes more, even though it has already moved from that position
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Gaurav Seth 6 years, 6 months ago
The object distance (u), image distance (v) and focal length (f).

The following sign convention is used for measuring various distances in the ray diagrams of spherical mirrors:
- All distances are measured from the pole of the mirror.
- Distances measured in the direction of the incident ray are positive and the distances measured in the direction opposite to that of the incident rays are negative.
- Distances measured above the principal axis are positive and that measured below the principal axis are negative.
- ?

The figure shows an object AB at a distance u from the pole of a concave mirror. The image A1B1 is formed at a distance v from the mirror. The position of the image is obtained by drawing a ray diagram.
Consider the D A1CB1 and D ACB

[when two angles of D A1CB1 and D ACB are equal then the third angle 




But ED = AB

From equations (1) and (2)

If D is very close to P then EF = PF



But PC = R, PB = u, PB1 = v, PF = f
By sign convention
PC = -R, PB = -u, PF = -f and PB1 = -v
Equation (3) can be written as





Dividing equation (4) throughout by uvf we get


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Organization is employed to achieve the overall objectives of business firms. Organization focuses attention of individuals objectives towards overall objectives. Optimum use of resources. Work should be divided and right people should be given right jobs to reduce the wastage of resources in an organization.
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Kavita Joshi 6 years, 6 months ago
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