The sun (diameter d) subtends an angle t...

The sun (diameter `d`) subtends an angle `theta` radian at the pole of a concave mirror of focal length `f`. What is the diameter of the image of the sun formed by the mirror ?

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From `1/v+1/u=1/f`
`1/v+1/(oo)=1/f`
`therefore" "v=f`
That is, image is formed at the focus F of the concave mirror. If A.B. is the size/diameter of image
`theta=(A.B.)/(PF)=d/f`
`d=ftheta`

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