MCQ
If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope
- ADecreases
- ✓Increases
- CGets halved
- DRemains unchanged
✓
Answer
Correct option: B.
Increases
b
(b) $R.P.$ $ \propto \frac{1}{\lambda } \Rightarrow \frac{{{{(R.P.)}_1}}}{{{{(R.P.)}_2}}} = \frac{{{\lambda _2}}}{{{\lambda _1}}} = \frac{5}{4}$
(b) $R.P.$ $ \propto \frac{1}{\lambda } \Rightarrow \frac{{{{(R.P.)}_1}}}{{{{(R.P.)}_2}}} = \frac{{{\lambda _2}}}{{{\lambda _1}}} = \frac{5}{4}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The maximum energy in the thermal radiation from a hot source occurs at a wavelength of $11 \times {10^{ - 5}}cm$. According to Wein's law, the temperature of the source (on Kelvin scale) will be $n$ times the temperature of another source (on Kelvin scale) for which the wavelength at maximum energy is $5.5 \times {10^{ - 5}}cm$. The value $n$ is
→A copper wire of length $10\,m$ and radius $\left(10^{-2} / \sqrt{\pi}\right) m$ has electrical resistance of $10 \,\Omega$. The current density in the wire for an electric field strength of $10( V / m )$ is :
→In the circuit shown $E, F, G$ and $H$ are cells of $\mathrm{e.m.f.}$ $2\,V, 1\,V, 3\,V$ and $1\,V$ respectively and their internal resistances are $2\,\Omega , 1\,\Omega , 3\,\Omega$ and $1\,\Omega$ respectively.
→When $x$ amount of heat is given to a gas at constant pressure, it performs $x/3$ amount of work. The average number of degrees of freedom per molecule is
→A string of mass $m$ and length $l$ hangs from ceiling as shown in the figure. Wave in string moves upward. $v_A$ and $v_B$ are the speeds of wave at $A$ and $B$ respectively. Then $v_B$ is
→Activity of a radioactive substance can be represented by various unit. Select correct option
Two infinitely long parallel wires having linear charge densities ${\lambda _1}$ and ${\lambda _2}$ respectively are placed at a distance of $R$ metres. The force per unit length on either wire will be $\left( {K = \frac{1}{{4\pi {\varepsilon _0}}}} \right)$
→Units for constants in Column $-\,I$ and $SI$ unit is given in Column $-\,II$ . Match the followings :
→| Column $-\,I$ | Column $-\,II$ |
| $(a)$ Wein's constant | $(i)$ $Wm^{-2}\,K^{-4}$ |
| $(b)$ Stefan-Boltzmaan's constant. | $(ii)$ $Wm^{-1}\,K^{4}$ |
| $(iii)$ $mK$ |
A sample of radioactive element containing $4 \times 10^{16}$ active nuclei. Half life of element is $10$ days, then number of decayed nuclei after $30$ days is ........ $\times 10^{16}$
→The effective spring constant of two spring system as shown in figure will be
