Question:
What is the focal length of double concave lens kept in air with two spherical surfaces radii R1= 20 cm and R2 = 40 cm. Take refractive index of lens n = \(\frac{5}{3}\)
What is the focal length of double concave lens kept in air with two spherical surfaces radii R1= 20 cm and R2 = 40 cm. Take refractive index of lens n = \(\frac{5}{3}\)
Updated On: May 24, 2024
- -20 cm
- 20 cm
- 40 cm
- -40 cm
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
The correct option is (A): -20 cm
Was this answer helpful?
2
4
Top Questions on Refraction of Light
- An unpolarised light beam strikes a glass surface at Brewster's angle. Then
- NEET (UG) - 2024
- Physics
- Refraction of Light
- For the thin convex lens, the radii of curvature are at 15 cm and 30 cm respectively. The focal length the lens is 20 cm. The refractive index of the material is :
- JEE Main - 2024
- Physics
- Refraction of Light
- In finding out the refractive index of the glass slab, the following observations were made through a travelling microscope: 50 vernier scale divisions (VSD), 49 MSD, 20 divisions on the main scale in each cm. For the mark on paper: \[ \text{MSR} = 8.45 \, \text{cm}, \quad \text{VC} = 26 \] For the mark on paper seen through the slab: \[ \text{MSR} = 7.12 \, \text{cm}, \quad \text{VC} = 41 \] For the powder particle on the top surface of the glass slab: \[ \text{MSR} = 4.05 \, \text{cm}, \quad \text{VC} = 1 \] (MSR = Main Scale Reading, VC = Vernier Coincidence) Refractive index of the glass slab is:
- JEE Main - 2024
- Physics
- Refraction of Light
- A light ray is incident on a glass slab of thickness \(4\sqrt{3}\) cm and refractive index \(\sqrt{2}\). The angle of incidence is equal to the critical angle for the glass slab with air. The lateral displacement of the ray after passing through the glass slab is _____ cm.
(Given \(\sin 15^\circ = 0.25\))- JEE Main - 2024
- Physics
- Refraction of Light
- Find minimum deviation in a thin prism if refractive index \(μ = cot\bigg(\frac{A}{2}\bigg)\). Here \(A\) represents the angle of prism.
- JEE Main - 2024
- Physics
- Refraction of Light
View More Questions
Questions Asked in TS POLYCET exam
- The value of \(\tan 26^\circ. \tan 64^\circ\) is
- TS POLYCET - 2023
- Trigonometry
- When white light is incident on a glass prism, the least deviated colour is
- TS POLYCET - 2023
- Wave Optics
- If 5x+py+8=0 and 10x+15y+12=0 has no solution, then p =
- TS POLYCET - 2023
- Quadratic Equations
- If \(\sec \theta = \frac{2}{\sqrt{3}}\),then \(cosθ=\)
- TS POLYCET - 2023
- Trigonometry
- In the figure, if AP and AQ are the two tangents to a circle with centre 'O' so that \(∠OQP=15°\), then \(∠QAP=\)
- TS POLYCET - 2023
- Tangent to a Circle
View More Questions