Physics · 2026
JEE Main · 22 January 2026, Shift 2 · Q41
In parallax method for the determination of focal length of a concave mirror, the object should always be placed:
In parallax method for the determination of focal length of a concave mirror, the object should always be placed :
Official answer
From NTA’s final answer key for this paper.
(3)
at any point beyond the focus $\displaystyle (F)$ of the mirror
More from Ray Optics
- 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
- If sunlight is focused on a paper using convex lens, it starts burning the paper in shortest time when the lens is kept at 30 cm above the paper. If…2026
- For a thin symmetric prism made of glass (refractive index 1.5), the ratio of incident angle and minimum deviation will be ____.2026
- An object A B is placed 15 cm on the left of a convex lens P of focal length 10 cm. Another convex lens Q is now placed 15 cm right of lens P. If the…2026
- Angle of minimum deviation is equal to the half of the angle of prism in an equilateral prism. The refractive index of the prism is ____.2026
- A thin convex lens and a thin concave lens are kept in contact and are co-axial. Which of the following statements is correct for this combination of…2026
JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.