Chapter 16: Problem 2219
A Plane mirror produces a magnification of (A) 0 (B) \(+1\) (C) \(-1\) (D) \(\infty\)
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One convex lens and one concave lens placed is contact with each other. If the ratio of their power is \((2 / 3)\) and focal length of the combination is $30 \mathrm{~cm}$, then individual focal lengths are (A) \(15 \mathrm{~cm}\) and \(-10 \mathrm{~cm}\) (B) \(-15 \mathrm{~cm}\) and \(10 \mathrm{~cm}\) (C) \(30 \mathrm{~cm}\) and \(-20 \mathrm{~cm}\) (D) \(-30 \mathrm{~cm}\) and \(-30 \mathrm{~cm}\)
Light of certain color contain 2000 waves in the length of \(1 \mathrm{~mm}\) in air. What will be the wavelength of this light in medium of refractive index \(1.25\) ? (A) \(1000 \AA\) (B) \(2000 \AA\) (C) \(3000 \AA\) (D) \(4000 \AA\)
The frequency of a light wave in a material is \(4 \times 10^{14} \mathrm{~Hz}\) and wavelength is \(5000 \AA\). The refractive index of material will be take \(\left.\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}\right)\) (A) \(1.5\) (B) \(1.7\) (C) \(1.33\) (D) None of these
What is the time taken in seconds to cross a glass plate of thickness $6 \mathrm{~mm}\( and \)\mu=2.0$ by light ? (A) \(8 \times 10^{-11}\) (B) \(4 \times 10^{-11}\) (C) \(2 \times 10^{11}\) (D) \(16 \times 10^{-11}\)
To get five images of a single object one should have two plane mirrors at an angle of (A) \(36^{\circ}\) (B) \(72^{\circ}\) (C) \(80^{\circ}\) (D) \(302^{\circ}\)
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