CUET · PHYSICS · PYQ PAPER 2023
An equiconvex lens has a focal length of 20 cm and its radius of curvature is 30 cm . Its refractive index is
- A \(\frac{3}{2}\)
- B \(\frac{5}{4}\)
- C \(\frac{7}{4}\)
- D \(\frac{7}{3}\)
Answer & Solution
Correct Answer
(C) \(\frac{7}{4}\)
Step-by-step Solution
Detailed explanation
\( \frac{1}{f} = (\mu - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \) \( \frac{1}{20} = (\mu - 1) \left( \frac{1}{30} - \frac{1}{-30} \right) \) \( \frac{1}{20} = (\mu - 1) \left( \frac{2}{30} \right) \) \( \mu - 1 = \frac{30}{2 \times 20} = \frac{3}{4} \)…
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
- The number of electrons in one coulomb of electric charge is :CUET 2023 Easy
- Donor energy level in 'n' type and acceptor energy level in 'p' type semiconductor are:CUET 2023 Easy
- Three capacitors of capacitance, \( 3 \, \mu \text{F}, 9 \, \mu \text{F} \) and \( 18 \, \mu \text{F} \) respectively are connected once in series and then in parallel. The ratio of equivalent capacitance in series to parallel is :CUET 2023 Medium
- The ratio of the electric field (E) and the magnetic field (B) associated with a plane electromagnetic wave is equal toCUET 2025 Medium
- During the p-n junction formation, when an electron diffuses from n \( \rightarrow \) p, it leaves behind an :CUET 2023 Hard
- In a coil, a current of 0.2 A increases at the rate of \( 0.4 \text{ A s}^{-1} \). If the power flow in the coil is \( 0.6 \text{ J s}^{-1} \) the inductance of the coil is:CUET 2025 Medium
More PYQs from CUET
- In the month of January, the number of cases diagnosed of influenza epidemic are given in the following table:
The 3-day moving averages are:Date 1 2 3 4 5 6 7 Number of cases 2 0 5 12 20 27 46 CUET 2025 Hard - In the given figure a rod PQ of length 2.5 m can slide without friction. The value of R is 5.0 \( \Omega \) and a magnetic field of 2 T is directed perpendicularly into the paper. The force F required to move the rod to the right at a constant speed of 1.0 m/s will be
CUET 2025 Medium - A thin infinite line charge has linear charge density of \( 2.0 \times 10^{-9} \text{ C/m} \). The electric field intensity at a distance of 3 m from the line charge is : (\( \frac{1}{4\pi\epsilon_0} = 9 \times 10^9 \))CUET 2023 Medium
- Which refining method is represented by the following equations ?
\(Zr+2I_2 \rightarrow ZrI_4\)
\(ZrI_4 \rightarrow Zr+ 2I_2\)CUET 2023 Easy - Which of the following statements are correct?
(A) Direction ratios of the line \(\frac{x-1}{2}=\frac{y+2}{3}=\frac{z-3}{4}\) are 2, 3, 4
(B) Direction ratios of the line \(\frac{x-1}{2}=\frac{2-y}{7}=\frac{2 z-1}{6}\) are 2, -7, 3
(C) Direction cosines of z axis are 0, 1, 0
(D) Direction ratios of the line joining the point (1, 2, -3) and (4, 5, 6) are 1, 1, 3
(E) Direction cosines of a line which makes equal angles with the coordinate axes are \(\frac{1}{3}, \frac{-1}{3}, \frac{1}{3}\)
Choose the correct answer from the options given below:CUET 2023 Hard - An ammeter of resistance \( 0.54 \text{ } \Omega \) reads current unto 1 A. The value of the shunt required to increase the range to 10 A isCUET 2025 Easy