Ray Optics · JEE Main previous year questions

2025 29 questions

1. Q382025 · 23 Jan 2025 · Shift 2

   The refractive index of the material of a glass prism is $\sqrt{3}$. The angle of minimum deviation is equal to the angle of the prism. What is the angle of the prism?

   1. A.$60^{\circ }$
   2. B.$50^{\circ }$
   3. C.$58^{\circ }$
   4. D.$48^{\circ }$
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   Answer: A

2. Q302025 · 22 Jan 2025 · Shift 1
   
   1. A.$-\frac{1}{6}\left(\frac{1}{|R_1|}-\frac{1}{|R_2|}\right)$
   2. B.$-\frac{1}{6}\left(\frac{1}{|R_1|}+\frac{1}{|R_2|}\right)$
   3. C.$\frac{1}{6}\left(\frac{1}{|R_1|}+\frac{1}{|R_2|}\right)$
   4. D.$\frac{1}{6}\left(\frac{1}{|R_1|}-\frac{1}{|R_2|}\right)$
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   Answer: A

3. Q422025 · 22 Jan 2025 · Shift 1

   Given is a thin convex lens of glass (refractive index $\mu$ ) and each side having radius of curvature $R$. One side is polished for complete reflection. At what distance from the lens, an object be placed on the optic axis so that the image gets formed on the object itself?

   1. A.$R/\mu$
   2. B.$R/(2\mu -1)$
   3. C.$R/(2\mu -3)$
   4. D.$\mu R$
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   Answer: B

4. Q462025 · 22 Jan 2025 · Shift 1· Numerical answer

   The driver sitting inside a parked car is watching vehicles approaching from behind with the help of his side view mirror, which is a convex mirror with radius of curvature $R=2\text{ m}$. Another car approaches him from behind with a uniform speed of $90\text{ km/hr}$. When the car is at a distance of $24\text{ m}$ from him, the magnitude of the acceleration of the image of the car in the side view mirror is ' $a$ '. The value of $100a$ is _________ ${\text{m/s}}^2$.

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   Answer: 8