A point object `O` is placed in front of a glass rod having spherical end of radius of curvature `30cm`. The image would be formed at

Options

A. 30 cm left
B. Infinity
C. 1 cm to the right
D. 18 cm to the left

Answer

A

Explanation

`(n_(2))/(v) - (n_(1))/(u) = (n_(2) - n_(2))/(R )`
`rArr (1.5)/(v) - (1)/((-15)) = (1.5 - 1)/(30) rArr v = -30 `cm
(-) sign indicates that, image is formed at same side of object. (i.e. left side).