SAMPLE QUESTIONS
1. A body is located on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance d ahead of second wall, then the required focal length will be
a) $only \frac{d}{4}$
b) $only \frac{d}{2}$
c) more than $\frac{d}{4}$ but less than $\frac{d}{2}$
d) less than $\frac{d}{4}$
2. Electromagnetic radiation of frequency v frequency, velocity v and wavelength λ , in air, enters a glass slab of refractive index μ ; The frequency, wavelength and velocity of light in the glass slab will be, respectively
a) $\frac{v}{\mu} , \frac{\lambda}{\mu}, v$
b) $v , \lambda, \frac{v}{\mu}$
c) $v, \frac{\lambda}{\mu}, \frac{v}{\mu}$
d) $\frac{v}{\mu}, \frac{\lambda}{\mu}, \frac{v}{\mu}$