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Radius of curvature of a concave spherical surface separating air-glass medium is R. A point object is placed on the principal axis in the glass `(m_(g) = 1.5)`. For the image to be real seen by observer in air, distance of the object from P should beA. `2 R lt u lt 3 R`B. `u lt 2R`C. `u = R`D. `u gt 3R` |
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Answer» Correct Answer - D `(mu_(2))/(v) - (mu_(1))/(v) = (mu_(2) - mu_(1))/(1)` `(1)/(v) - (1.5)/(-u) = (1 - 1.5)/(R )` for v to be `+ve, (1)/(2R) - (3)/(2u) gt 0` or `u gt 3R` |
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