The focal length is the distance from the midline of the lens to the
image
object
focal point
2f position

The focal length is the distance from the mid-line of the lens to the Focal Point.

Focal point lies at a distance which is half the radius of curvature of the lens. hence focal length is also given by the formula

f = R/2

where f = focal length

R = radius of the focal length

hence the correct choice is focal point.

when cloud cover increases then the suns ray's which provides the earth with light and warmth gets covered due to the due to the suns ray's being blocked, the temperature in that region

therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

happy to

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