A convex lens gives a virtual image only when the objects lies_________________?
Correct answer: D. between principal focus and optical center
- A. between principal focus and center of curvature
- B. beyond 2 f
- C. at the principal focus
- D. between principal focus and optical center
Explanation
A convex lens forms a virtual, erect and magnified image when the object is placed between the principal focus and the optical centre. In this position the refracted rays diverge and their backward extensions meet on the object side. The likely mistake is choosing a, because an object between f and 2f forms a real, inverted image rather than a virtual one.
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About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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