MHT CET · Physics · Ray Optics
By increasing the aperture of the objective lens, wavelength of light, focal length
of the objective lens and the resolving power of an astronomical telescope
respectively
- A is not affected, increases, decreases.
- B increases, decreases, is not affected.
- C decreases, increases, is not affected.
- D is not affected, decreases, increases.
Answer & Solution
Correct Answer
(B) increases, decreases, is not affected.
Step-by-step Solution
Detailed explanation
(A)
Resolving power of the telescope \(\quad \mathrm{RP}=\frac{\mathrm{a}}{1.22 \lambda}\)
where a is the diameter (aperture) of the objective lens.
\(\Longrightarrow \quad \mathrm{RP} \propto \mathrm{a}\)
Thus the aperture of the objective lens is made so large so as to increase the resolving power of the telescope.
Resolving power of the telescope \(\quad \mathrm{RP}=\frac{\mathrm{a}}{1.22 \lambda}\)
where a is the diameter (aperture) of the objective lens.
\(\Longrightarrow \quad \mathrm{RP} \propto \mathrm{a}\)
Thus the aperture of the objective lens is made so large so as to increase the resolving power of the telescope.
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