1.

For a thin convex lens when the heights of the object is double than its image, its object distance is equal to ....... Focal length of a lens is f.

Answer»

f
2f
3f
4f

Solution :`m=(h_2)/(h_1)=(h_2)/(2h_2)=1/2`
Accepting that IMAGE is inverted m =`-1/2`
`m=V/u=-1/2implies v=(-u)/(2)`
For mirror `1/f=(-1)/(u)+1/v`
`implies -u=3f`
(As per sign CONVENTION object distance is NEGATIVE)


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