TS EAMCET · Physics · Ray Optics
The focal length of a lens of dispersive power 0.45 which should be placed in contact with a convex lens of focal length \(84 \mathrm{~cm}\) and dispersive power 0.21 to make the achromatic combination from the two lenses, in \(\mathrm{cm}\) is
- A 45
- B 90
- C 180
- D -180
Answer & Solution
Correct Answer
(D) -180
Step-by-step Solution
Detailed explanation
Here, \(\quad \omega_1=0.45\) \(\omega_2=0.21\) and \(f_2=84 \mathrm{~cm}\) As the lens are kept is contact it is achromatic condition.…
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
- A TV transmitting antenna is \(128 \mathrm{~m}\), tall. If the receiving antenna is at the ground level, the maximum distance between, them for satisfactory communication in line of sight mode is (radius of the earth \(6.4 \times 10^6 \mathrm{~m}\) )TS EAMCET 2014 Easy
- A horizontal aluminium rod of diameter \(4 \mathrm{~cm}\) projected \(6 \mathrm{~cm}\) from a wall. An object of mass \(400 \pi \mathrm{kg}\) is suspended from the end of the rod. The shearing modulus of aluminium is \(3.0 \times 10^{10} \mathrm{~N} / \mathrm{m}^2\). The vertical deflection of the end of the rod is \(\left(\because g=10 \mathrm{~m} / \mathrm{s}^2\right)\)TS EAMCET 2019 Easy
- A physical quantity \(\mathrm{S}\) is related to four observables \(\mathrm{a}, \mathrm{b}, \mathrm{c}\), \(\mathrm{d}\) as \(\mathrm{S}=\frac{\sqrt{a} b}{c^3 d^4}\). If the percentage errors of measurement in a, b, c, d are \(2 \%, 1 \%, 1 \%\) and \(1 \%\) respectively, then percentage error in the quantity \(\mathrm{S}\) isTS EAMCET 2022 Easy
- Two blocks of masses \(2 \mathrm{~kg}\) and \(1 \mathrm{~kg}\) are tied to the ends of a string which passes over a light frictionless pulley. The blocks are held at rest at the same horizontal level and then released suddenly. The distance traversed by their centre of mass in 2 seconds is (acceleration due to gravity \(=10 \mathrm{~ms}^{-2}\) )TS EAMCET 2023 Medium
- A uniform circular disc of radius \(R\), lying on a frictionless horizontal plane is rotating with an angular velocity ' \(\omega\) ' about is its own axis. Another identical circular disc is gently placed on the top of the first disc coaxially. The loss in rotational kinetic energy due to friction between the two discs, as they acquire common angular velocity is ( \(I\) is moment of inertia of the disc)TS EAMCET 2013 Easy
- A magnetic dipole is under the influence of two orthogonal magnetic fields, \(B_1=0.5 \times 10^{-3} \mathrm{~T}\) and \(B_2=0.866 \times 10^{-3} \mathrm{~T}\). If the dipole comes to stable equilibrium at an angle \(\theta\) with respect to \(B_2\) field, then the value of \(\theta\) isTS EAMCET 2018 Easy
More PYQs from TS EAMCET
- An alpha particle and a proton are accelerated from rest in a uniform electric field. The ratio of the times taken by proton and alpha particle to attain equal displacements isTS EAMCET 2025 Medium
- Estimate the magnitude of current that passes through a wire, if of electrons flow through it in . (Assume Avogadro number )TS EAMCET 2019 Easy
- The height of transmitting antenna if TV programs have to cover the population in area of radius is
[Use Radius of earth ]TS EAMCET 2021 Easy - A conducting circular coil is placed in uniform magnetic field with the magnetic field initially directed perpendicular to the plane of the coil. In step A, the coil is rotated from its initial position by \(60^{\circ}\) about its diameters in time ' \(t\) '. In step B, the coil is further rotated about the same axis in the same sense by another \(120^{\circ}\) in time ' \(2 \mathrm{t}\) '. Ratio of emf induced in the coil in step A to that in step B isTS EAMCET 2023 Hard
- A solid sphere of mass \(5 \mathrm{~kg}\) rolls on a plane surfaces. Find its kinetic energy at an instant when its centre moves with speed \(4 \mathrm{~m} / \mathrm{s}\).TS EAMCET 2019 Easy
- A long solenoid has and carries current . An electron moves within the solenoid in a circle of radius perpendicular to the solenoid axis. If the speed of the electron is then the current in the solenoid is
(Take unit, mass of electron , charge of electron )TS EAMCET 2022 Hard