TS EAMCET · Physics · Ray Optics
The focal length of biconvex lens made of glass, of equal radii is \(f\). If the lens is dipped in the water, then the focal length becomes (Take, refractive index of glass and water as \(\frac{3}{2}\) and \(\frac{4}{3}\), respectively)
- A 2f
- B 4f
- C \((5 / 3) f\)
- D \((7 / 4) f\)
Answer & Solution
Correct Answer
(B) 4f
Step-by-step Solution
Detailed explanation
Focal length of the biconvex lens is \(f\). Radii are equal, i.e. \(R_1=R_2=R\). \[ { }_a \mu_g=\frac{3}{2} \] \[ { }_a \mu_w=\frac{4}{3} \] According to lens Maker's formula, \[ \therefore \quad \frac{1}{f}=(\mu-1)\left(\frac{1}{R_1}-\frac{1}{R_2}\right) \] Here, \(R_1=R\) and…
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
- An oscillating circuit consisting of a capacitor with capacitance \(C=10 \mu \mathrm{F}\), a coil with inductance \(L=6.0 \mu \mathrm{H}\) and active resistance \(R=10 \Omega\). The mean power that should be fed to the circuit to maintain undamped harmonic oscillations with an external driving power with \(50 \mathrm{~Hz}\) and a \(V_m\) of \(280 \mathrm{~V}\) isTS EAMCET 2018 Hard
- The two surfaces of a concave lens, made of glass of refractive index 1.5 have the same radii of curvature \(R\). It is now immersed in a medium of refractive index 1.75 , then the lensTS EAMCET 2013 Hard
- A ray of light passes through an equilateral prism such that the angle of incidence is equal to the angle of emergence and each one is equal to \(3 / 4\) th the angle of prism. The angle of deviation isTS EAMCET 2010 Easy
- Statement (S) : Using Huygen's eye-piece measurements can be taken but are not correct. Reason (R) : The cross wires, scale and final image are not magnified proportionately because the image of the object is magnified by two lenses, whereas the cross wire scale is magnified by one lens only. Identify the correct one of the followingTS EAMCET 2008 Easy
- Consider an ideal gas in a closed container at The container is then heated so that the average velocity of particles of the gas increases by a factor of What would be the final temperature?TS EAMCET 2021 Medium
- An athelete completes one round of a circular track of radius \(R\) in \(40 \mathrm{~s}\). What will be his displacement at the end of \(2 \min 20 \mathrm{~s}\) ?TS EAMCET 2010 Hard
More PYQs from TS EAMCET
- At a given place, to increase the number of oscillations made by a simple pendulum in one minute from 72 to 90, the length of the pendulum is to be decreased byTS EAMCET 2025 Medium
- Three parallel wires a, b and c carrying currents \(i_a, i_b\) and \(i_c\) as shown in the figure are placed next to each other.
The magnitude force on a length \(l\) of the wire a, if \(\mathrm{d}_2=2 \mathrm{~d}_1, i_b=i_a\) and \(i_c=4 i_a\) isTS EAMCET 2022 Easy - Assertion : The zeroth law of thermodynamics leads to the concept of temperature. Reason : The zeroth law states that two systems in thermal equilibrium with a third system are in thermal equilibrium with each other. The correct option among the following isTS EAMCET 2022 Easy
- Dimensions of the quantity \(\frac{p}{\varepsilon_0 \mu_0}\), where \(p\) is the pressure, \(\varepsilon_0\) is electric permittivity of free space and \(\mu_0\) is permeability of free space, will beTS EAMCET 2018 Easy
- Statement (I) : The force of attraction due to a hollow spherical shell of uniform density on a point mass situated inside it is always positive . Statement (II) : The force of attraction between a hollow spherical shell of uniform density and a point mass situated outside is same just as if the entire mass of the shell is at the centre of the shell. Which of the following is correct?TS EAMCET 2022 Medium
- The radiation emitted by a star \(A\) is 10000 times that of the sun. If the surface temperatures of the sun and the star \(A\) are \(6000 \mathrm{~K}\) and \(2000 \mathrm{~K}\) respectively, the ratio of the radii of the star \(A\) and the sun is :TS EAMCET 2003 Easy