How to write 1.25 as a rational number

Define the term national benchmark test and mention two reasons why it is important in the university application process

Answer:

Lenses with long focal lengths are called telephoto lenses, and have a smaller field of view. Depth of field. Lenses with long focal lengths tend to have a shallow depth of field, which means they can focus in on small objects (even faraway ones) at specific distance

Explanation:

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The lens with a long focal length is thin and not strongly curved.

Explanation:

→ The focal length of a lens depends upon the thickness as well as curvature of the lens.

→ A thick lens will refract and converge the light up to a greater extent and thus decreasing its focal length. On the other hand, a thin lens will refract and converge the light to a lesser extent and thus increasing its focal length.

• Therefore a lens with a longer focal length is thicker in size whereas a lens with a smaller focal length is thinner in size.

→ The higher angles of curvature of the lens lead to shorter focal lengths because light waves are refracted at a greater angle with respect to the principal axis of the lens hence decreasing its focal length.

• Thus a lens with a strong curvature has a smaller focal length whereas a lens with a small angle of curvature has a larger focal length.

Hence we can say that the lens with a long focal length is thin and not strongly curved.

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Answer:

Troposphere. Known as the lower atmosphere almost all weather occurs in this region. The troposphere begins at the Earth's surface and extends from 4 to 12 miles (6 to 20 km) high. The height of the troposphere varies from the equator to the poles.

Explanation:

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