Diffraction

To determine the position of a point like object precisely, _____ light should be used.

The intensity of diffracted light at any point on the screen is given by the formula $I=I_o{\left(\frac{\sin \alpha }{\alpha }\right)}^2$, using this formula give the conditions for central maximum, minima, and maxima. Where $I_{\circ }=$maximum intensity and $\alpha =\frac{\mathrm{\pi d} \mathrm{sin\theta }}{\lambda }$.

With proper diagram, explain the resolving power of a microscope and obtain its formula.

To determine the position of a point object precisely_______light should be used.

Light of wavelength $6000 \stackrel{\circ }{A}$ is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of $100 \mathrm{inch}$?