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Q.
Which of the following statements is/are correct about a convex lens?
Ray Optics and Optical Instruments
Solution:
I. Convex lens is a converging lens provided refractive index of the material of the lens is greater than the surrounding medium in which the lens is kept.
From Lens makers formula,$\frac{1}{f}=\left(\mu_{2}-1\right)\left(\frac{1}{R_{1}}-\frac{1}{R_{2}}\right)$
Refracting index of lens varies inversely with the wavelength of light used.
II. For virtual object, image is real for convex lens.
III. For object (real) between and $O$, image is virtual.
