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#8 | Problems

(Physics) > Ray Optics and Optical Instruments

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Related Practice Questions :

Absolute refractive indices of glass and water are 3/2 and 4/3. The ratio of velocity of light in glass and water will be

1. 4:3

2. 8:7

3. 8:9

4. 3:4

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When a ray is refracted from one medium to another, the wavelength changes from 6000$\stackrel{0}{\mathrm{A}}$ to 4000$\stackrel{0}{\mathrm{A}}$. The critical angle for the interface will be:

1. ${\mathrm{cos}}^{-1}\left(\frac{2}{3}\right)$

2. ${\mathrm{sin}}^{-1}\left(\frac{2}{\sqrt{3}}\right)$

3. ${\mathrm{sin}}^{-1}\left(\frac{2}{3}\right)$

4. ${\mathrm{cos}}^{-1}\left(\frac{2}{\sqrt{3}}\right)$

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One face of a rectangular glass plate 6 *cm* thick is silvered. An object held 8 *cm* in front of the first face, forms an image 10 *cm* behind the silvered face. The refractive index of the glass is [Consider that light ray returns back in the first medium]

(a) 0.4 (b) 0.8

(c) 1.5 (d) 1.6

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One side of a glass slab is silvered as shown. A ray of light is incident on the other side at angle of incidence of ${45}^{0}$. The Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is:

(a) 90^{o}

(b) 180^{o}

(c) 120^{o}

(d) 45^{o}

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Two transparent slabs have the same thickness as shown. One is made of material *A* of refractive index 1.5. The other is made of two materials *B* and *C* with thickness in the ratio 1:2. The refractive index of *C* is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of *B* is

(a) 1.1 (b) 1.2

(c) 1.3* *(d) 1.4

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