A 4 cm high object is located 10 cm from the converging lens, whose focal length is 20 cm. The image so formed will be
Correct answer: E. Both virtual and erect
- A. Virtual
- B. Erect
- C. Real
- D. Inverted
- E. Both virtual and erect
Explanation
First, the object is closer than the focus - this is a magnifying glass so, the image is erect, enlarged, and virtual.Use lens formula: 1/u + 1/v = 1/f.1/10 + 1/v = 1/201/v = 1/20 - 1/10 = -1/20v = -20 M=v/u = -2The image is erect, virtual, twice the size, and 20 cm from the lens.
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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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