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12th Standard English Medium Physics Subject Wave Optics Book Back 1 Mark Questions with Solution Part - II

Published on: 01/06/2021

QB365 provides detailed and simple solution for every Book back Questions in class 12 Physics Subject. It will helps to get more idea about question pattern in every book back questions with solution.

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Std: 12th Standard - Physics

chapter: - Book back Questions

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Questions:

Multiple Choice Question

5 x 1 = 5

Light transmitted by Nicol prism is, _____.

(a)

partially polarised

(b)

unpolarised

(c)

plane polarised

(d)

elliptically polarised

A ray of light strikes a glass plate at an angle 60^o. If the reflected and refracted rays are perpendicular to each other, the refractive index of the glass is, _____.

(a)

\(\sqrt3\)

(b)

\(\frac{3}{2}\)

(c)

\(\sqrt{\frac{3}{2}}\)

(d)

First diffraction minimum due to a single slit of width 1.0 x 10^–5 cm is at 30^o. Then wavelength of light used is,_____.

(a)

400 \(\mathring { A } \)

(b)

500 \(\mathring { A } \)

(c)

600 \(\mathring { A } \)

(d)

700 \(\mathring { A } \)

When light is incident on a soap film of thickness 5 x 10^–5 cm, the wavelength of light reflected maximum in the visible region is 5320 Å. Refractive index of the film will be, _____.

(a)

1.22

(b)

1.33

(c)

1.51

(d)

1.83

In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to, _____.

(a)

(b)

\(\frac{D}{2}\)

(c)

\(\sqrt{2}\)D

(d)

\(\frac{D}{\sqrt2}\)

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Answers Key:

Multiple Choice Question

5 x 1 = 5

n = tan i_p = tan 60^o = \(\sqrt{3}\)

(b)
500 \(\mathring { A } \)

2n t cos r = (2m + 1) \(\frac{\lambda}{2}\)
For maximum
m = 2 (For visible region), n - refractive index.
cos r = cos 0 = 1
t = 5 x 10^-5 x 10^-2 = 5 x 10^-7 m
\(n=\frac{(2m+1)\frac{\lambda}{2}}{2t}=\frac{5\lambda}{2 \times 2 \times t}\)
\(=\frac{5 \times5320\times10^{-10}}{4 \times 5 \times 10^{-7}}\)
\(=\frac{5 \times5320\times10^{-10}}{20}=1330 \times 10^3\)
n = 1.330