Chapter 16

The velocity of light is maximum in a medium of (A) diamond (B) water (C) glass (D) vacuum

A light of wavelength $320\mathrm{nm}$ enters in a medium of refractive index $1.6$ from the air of refractive index $1.0$. The new wavelength of light in the medium will be $\mathrm{nm}$. (A) 520 (B) 400 (C) 320 (D) 200

"Bhautik" runs towards a plane mirror with a speed of $20{\mathrm{ms}}^{-1}$, what is the speed of his image ? (A) $45{\mathrm{ms}}^{-1}$ (B) $20{\mathrm{ms}}^{-1}$ (C) $15{\mathrm{ms}}^{-1}$ (D) $7.5{\mathrm{ms}}^{-1}$

A ray of light is incident at an angle ${30}^{\circ }$ on a mirror, The angle between normal and reflected ray is (A) ${15}^{\circ }$ (B) ${30}^{\circ }$ (C) ${45}^{\circ }$ (D) ${60}^{\circ }$

The no. of images formed between two parallel plane mirror are (A) $\mathrm{\infty }$ (B) 0 (C) 180 (D) 360

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) ${302}^{\circ }$

For four different transparent medium ${\mathrm{n}}_{41}\times {\mathrm{n}}_{12}\times {\mathrm{n}}_{21}=$ (A) $\left(1/{\mathrm{n}}_{41}\right)$ (B) ${\mathrm{n}}_{41}$ (C) ${\mathrm{n}}_{14}$ (D) $\left(1/{\mathrm{n}}_{14}\right)$

A Plane mirror produces a magnification of (A) 0 (B) $+1$ (C) $-1$ (D) $\mathrm{\infty }$

The power of plane glass is (A) $\mathrm{\infty }$ (B) 0 (C) $\overline{2\mathrm{D}}$ (D) $4\mathrm{D}$

Two thin lenses of focal length ${\mathrm{f}}_1$ and ${\mathrm{f}}_2$ are coaxially placed in contact with each other then the power of combination is (A) $\left[({\mathrm{f}}_1+{\mathrm{f}}_2)/2\right]$ (B) $\sqrt{\left(f_1/f_2\right)}$ (C) $\left[\left({\mathrm{f}}_1{\mathrm{f}}_2\right)/({\mathrm{f}}_1+{\mathrm{f}}_2)\right]$ (D) $\left[({\mathrm{f}}_1+{\mathrm{f}}_2)/\left({\mathrm{f}}_1{\mathrm{f}}_2\right)\right]$