$A$ microscope objective gathers light over a cone of semi-vertex $30^o$ and uses visible light of wavelength $5500 \text{ Å}$. Its resolving limit is

  • A
    $2.5 \times 10^{-5} \text{ cm}$
  • B
    $4.6 \times 10^{-5} \text{ cm}$
  • C
    $3.9 \times 10^{-5} \text{ cm}$
  • D
    $6.7 \times 10^{-5} \text{ cm}$

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Resolving power of a telescope increases when

The diameter of the pupil of the human eye is about $2 \, mm$. The human eye is most sensitive to the wavelength of $555 \, nm$. The limit of resolution of the human eye is ....... $min$.

Explain the resolving power of optical instruments and explain the resolving power of telescopes.

The wavelengths of light used in an optical instrument are ${\lambda _1 = 4000 \ \text{\AA}}$ and ${\lambda _2 = 5000 \ \text{\AA}}$. The ratio of their respective resolving powers (corresponding to ${\lambda _1}$ and ${\lambda _2}$) is:

Two points separated by a distance of $0.1\,mm$ can just be resolved in a microscope when a light of wavelength $6000\ \mathring{A}$ is used. If the light of wavelength $4800\ \mathring{A}$ is used,this limit of resolution becomes.......$mm$.

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