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23.An object O is placed at a distance x from the focus of a convex lens and its image I is formed at a distance x' from the other focus as shown in the figure. The distance x, x' satisfy the relation (1) F = xx' (2) F = (x+x')/2 (3) 2F greater than equal to x+x' (4) 2F less than equal to x+x' |
| Answer» 23.An object O is placed at a distance x from the focus of a convex lens and its image I is formed at a distance x' from the other focus as shown in the figure. The distance x, x' satisfy the relation (1) F = xx' (2) F = (x+x')/2 (3) 2F greater than equal to x+x' (4) 2F less than equal to x+x' | |