Physics · 2015
JEE Main · 11 April 2015, Shift 1 · Q24
A thin convex lens of focal length 'f' is put on a plane mirror as shown in the figure. When an object is kept at a distance 'a' from the lens -…
A thin convex lens of focal length 'f' is put on a plane mirror as shown in the figure. When an object is kept at a distance 'a' from the lens - mirror combination, its image is formed at a distance $\displaystyle \frac{\mathrm{a}}{3}$ in front of the combination. The value of 'a' is :
Official answer
(2)
2f
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
- A ray of light AO in vacuum is incident on a glass slab at angle 60^° and refracted at angle 30° along OB as shown in the figure. The optical path…2019
- 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
- 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…2024
- 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
JEE Main 2015 Physics question, with the answer from NTA’s final answer key. Where our answers come from.