MHT CET · Physics · Ray Optics
The magnifying power of an refracting type of astronomical telescope is 'm'. If focal
length of the eyepiece is doubled, the magnifying power will become
- A \(\frac{\text { m }}{4}\)
- B \(\frac{n}{2}\)
- C \(2 \mathrm{~m}\)
- D \(\mathrm{m}\)
Answer & Solution
Correct Answer
(B) \(\frac{n}{2}\)
Step-by-step Solution
Detailed explanation
The magnifying power \(\mathrm{m}=\frac{\mathrm{f}_{0}}{\mathrm{f}_{\mathrm{e}}}\)
If \(\mathrm{f}_{\mathrm{e}}\) is doubled, the magnifying power becomes half.
If \(\mathrm{f}_{\mathrm{e}}\) is doubled, the magnifying power becomes half.
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- Two coils have a mutual inductance \(0. 003 \mathrm{H}\). The current changes in the first coil according to equation \(\mathrm{I}=\mathrm{I}_0 \quad \sin \omega \mathrm{t}\), where \(\mathrm{I}_0=8 \mathrm{~A}\) and \(\omega=100 \pi \mathrm{rad} \mathrm{s}^{-1}\). The maximum value of e.m.f. in the second coil isMHT CET 2024 Medium
- The angle between particle velocity and wave velocity in a transverse wave isMHT CET 2008 Medium
- Two capillary tubes of different diameters are dipped in water. The rise of water isMHT CET 2019 Medium
- A string is under tension of 180 N and mass per unit length \(2 \times 10^{-3} \mathrm{Kg} / \mathrm{m}\). It produces two consecutive resonant frequencies with a tuning fork, which are 375 Hz and 450 Hz . The mass of the string isMHT CET 2024 Medium
- The ratio of angular momentum \(\overrightarrow{\mathrm{L}}\) of an electron to the magnetic dipole moment \(\overrightarrow{\mathrm{m}}_{\text {orb }}\) is ( ' m ' is mass of electron, ' e ' is charge on electron)MHT CET 2025 Easy
- The electric potential ' \(V\) ' is given as a function of distance ' \(x\) ' (metre) by \(V=\left(4 x^2+8 x-3\right) V\). The value of electric field at \(x=0.5 \mathrm{~m}\), in \(\mathrm{V} / \mathrm{m}\) isMHT CET 2025 Easy
More PYQs from MHT CET
- Let two non-collinear vectors \(\hat{a}\) and \(\hat{b}\) form an acute angle. A point \(\mathrm{P}\) moves, so that at any time \(t\) the position vector \(\overline{\mathrm{OP}}\), where \(\mathrm{O}\) is origin, is given by \(\hat{a} \sin t+\hat{b} \cos t\), when \(P\) is farthest from origin \(\mathrm{O}\), let \(\mathrm{M}\) be the length of \(\overline{\mathrm{OP}}\) and \(\hat{\mathrm{u}}\) be the unit vector along \(\overline{\mathrm{OP}}\), thenMHT CET 2023 Hard
- Two-point charges \(+Q\) and \(+q\) repel each other with a force of \(100 \mathrm{~N}\). Keeping the distance between them unchanged, if \(Q\) is increased by \(10 \%\) and \(q\) is decreased by \(q\) the force of repulsion between them will.MHT CET 2022 Easy
- The peptide chains loop, twist and fold back on themselves due to the formation of________ bonds to form stable tertiary structure of protein.MHT CET 2021 Medium
- The probability that at least one of the events \(A\) and \(B\) occurs is 0.6 . If \(A\) and \(B\) occur simultaneously with probability 0.2 , then \(P\left(A^{\prime}\right)+P\left(B^{\prime}\right)\) is equal toMHT CET 2022 Medium
- What is enthalpy of formation of \(\mathrm{NH}_3\) if bond enthalpies are as \((\mathrm{N} \equiv \mathrm{N})=941 \mathrm{~kJ},(\mathrm{H}-\mathrm{H})=436 \mathrm{~kJ},\) \((\mathrm{~N}-\mathrm{H})=389 \mathrm{~kJ}\) ?MHT CET 2021 Easy
- A wire of Young's modulus \(1 \cdot 6 \times 10^{12} \mathrm{~N} / \mathrm{m}^{2}\) is stretched by a force so as to produce a strain of \(2 \times 10^{-4}\). The energy density of the wire isMHT CET 2020 Medium