CUET · PHYSICS · PYQ PAPER 2023
The focal length of a thin lens in vacuum is f. If the material of the lens has refractive index \( \frac{3}{2} \), its focal length when immersed in water of refractive index \( \frac{4}{3} \) would be :
- A 2f
- B f
- C 4f
- D \( \frac{4f}{3} \)
Answer & Solution
Correct Answer
(C) 4f
Step-by-step Solution
Detailed explanation
\( \frac{1}{f} = (n_l - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \) \( \frac{1}{f_w} = \left( \frac{n_l}{n_w} - 1 \right) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \) \( f_w = f \frac{n_l - 1}{\frac{n_l}{n_w} - 1} \)…
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
- In a series LCR circuit, \( C = 5 \text{ }\mu\text{F} \) and \( \omega = 1000 \text{ rad/s} \). The value of inductance L for which the current is maximum in this circuit will be :CUET 2025 Medium
- If the frequency of an alternating current is doubled while keeping the inductance constant, then the inductive reactanceCUET 2025 Easy
- The electric field amplitude of an electromagnetic wave is \(100 N C ^{-1}\) and its frequency is 50 MHz . What is the magnitude of wave vector \(k\), (given speed of electromagnetic wave is \(3 \times 10^8 m s ^{-1}\) )CUET 2023 Medium
- Which are the correct statements from given below:
A. Kirchhoff's junction rule is based on conservation of charge
B. Current is a vector quantity.
C. Current density is a vector quantity.
D. Resistance doesn't depend on dimension of conductor.
E. Resistivity depends on temperature.CUET 2023 Easy - One student has to make an electromagnet using a coil of copper wire. He needs a ferromagnetic material to make its core. This core material should haveCUET 2025 Easy
- From the following, choose the element for impurity atoms with which pure silicon should be doped to make it a p-type semiconductor:CUET 2023 Hard
More PYQs from CUET
- Derivative of \(2 x^2\) with respect to \(5 x^4\) is:CUET 2023 Hard
- Consider the various type of Innate Immunity and Match List I with List II
Choose the correct answer from the options given below:List - I List - II (A) Skin (I) Physiological barrier (B) Saliva (II) Physical barrier (C) Leukocyte (III) Cytokine barrier (D) Interferon (IV) Cellular barrier CUET 2023 Easy - If \(x, y\) and \(z\) are non zero real numbers, the inverse of matrix \(A=\left[\begin{array}{lll}x & 0 & 0 \\ 0 & y & 0 \\ 0 & 0 & z\end{array}\right]\) is:CUET 2023 Medium
- The power of a combination of convex lens of focal length 40 cm and a concave lens of focal length 25 cm when placed in contact is :CUET 2023 Medium
- Which of the following defects are shown by \(\text{KCl}\) Crystal?
(A) Schottky defect
(B) Frenkel defect
(C) Metal excess defect
(D) Metal deficiency defect
Choose the correct answer from the options given below :CUET 2023 Easy - In the given setup of meter bridge, the null point D is obtained at a distance of 40 cm from end A. If a resistance of 10 \( \Omega \) is connected in series with \( R_1 \), the null points shift by 20 cm. The values of \( R_1 \) and \( R_2 \) respectively are
CUET 2025 Medium