Physics
For which position of the object in front of convex lens, the image distance will be negative ?

Answer
Between optical center and focus of convex lens:

Reason — For a convex lens, the image distance is considered negative when the image is formed on the same side as the incident light. This typically occurs when the object is placed within the focal length (between the lens and its focal point). So, if the object is positioned anywhere within the focal length of a convex lens, the image distance will be negative.

Related Questions
If current through a resistance is doubled and its resistance made one-fourth, then the value of power dissipation will
- remain same
- double
- become 4 times
- become 1⁄4 time
A bar magnet is used to pick up an iron nail. At which parts of the nail it is easiest for the magnet to pick it up?
- At end X
- At mid-point Y
- At end Z
- Same at all points
A ray of light suffers refraction through an equilateral prism. The deviation produced by the prism does not depend on the
- angle of incidence
- colour of light
- material of prism
- size of prism
(a) Give two reasons as to why the efficiency of a single removable pulley system is always less than 100%.
(b) Why a thick lead container is required to keep a radioactive substance?
(c) What is the principle of moments?