Physics · 2024
JEE Main · 29 January 2024, Shift 1 · Q45
A biconvex lens of refractive index 1.5 has a focal length of 20 cm in air. Its focal length when immersed in a liquid of refractive index 1.6 will…
A biconvex lens of refractive index $\displaystyle 1.5$ has a focal length of $\displaystyle 20$ cm in air. Its focal length when immersed in a liquid of refractive index $\displaystyle 1.6$ will be:
Official answer
From NTA’s final answer key for this paper.
(1)
$\displaystyle -160 \mathrm{~cm}$
More from Ray Optics
- A convex lens of refractive index 1.5 and focal length f=18 cm is immersed in water. The difference in focal lengths of the given lens when it is in…2026
- A biconvex lens is formed by using two thin planoconvex lenses, as shown in the figure. The refractive index and radius of curved surfaces are also…2026
- For a transparent prism, if the angle of minimum deviation is equal to its refracting angle, the refractive index n of the prism satisfies.2026
- A slanted object AB is placed on one side of convex lens as shown in the diagram. The image is formed on the opposite side. Angle made by the image…2025
- Distance between object and its image (magnified by -1/3 ) is 30 cm. The focal length of the mirror used is (x/4) cm, where magnitude of value of x…2025
- A ray of light passing through an equilateral prism is having velocity 2.12 × 10^8 m / s in the prism material, then the minimum angle of deviation…2026
- One side of an equilateral prism is painted by a transparent material of refractive index n_2. The refractive index of prism is 1.6. The minimum…2026
- A convex lens is made from glass material having refractive index of 1.4 with same radius of curvature on both sides. The ratio of its focal length…2026
JEE Main 2024 Physics question, with the answer from NTA’s final answer key. Where our answers come from.