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Radius of curvature of a concave spheric...

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 be

A

`2 R lt u lt 3 R`

B

`u lt 2R`

C

`u = R`

D

`u gt 3R`

Text Solution

Verified by Experts

The correct Answer is:
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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