A converging lens is used to produce an image on a screen of an object. What change is needed for the image to be formed nearer to the lens?
Correct answer: D. Move the object closer to the lens
- A. Increase the focal length of the lens (lens and position of object is fixed)
- B. Insert a diverging lens between the lens and the screen (converging lens and position of object is fixed)
- C. Increase the distance of the object from the lens
- D. Move the object closer to the lens
Explanation
To make the image nearer to the lens, you should move the object closer to it. According to the lens formula (1/f = 1/v - 1/u), when the object distance (u) decreases, the image distance (v) also decreases. As a result, the image forms nearer to the lens.
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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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