PYQSidePowered byPrepblink ExamsMy practice

Ray Optics and Optical Instruments

JEE Main 2025 (Online) 23rd January Morning ShiftMCQHard📈 Topic in 53% papers+4−1
Ques. 1JEE Main 2025, 23 January (Morning Shift)

Given a thin convex lens (refractive index 2), kept in a liquid (refractive index 1, 1< 2) having radii of curvatures |R1| and |R2|. Its second surface is silver polished. Where should an object be placed on the optic axis so that a real and inverted image is formed at the same place?

  1. ( 2+ 1)|R1|( 2- 1)
  2. 1|R1| |R2| 2 (2|R1|+|R2| )- 1 |R1| |R2|
  3. 1|R1| |R2| 2 (|R1|+|R2| )- 1|R1|
  4. 1|R1| |R2| 2 (|R1|+|R2| )- 1|R2|

Answer

(4) 1|R1| |R2| 2 (|R1|+|R2| )- 1|R2|

Solution

Silvered lens acts as a mirror (refraction, reflection, refraction): 1feq= 2f + 1fm

1f = ( 2- 1)(|R1|+|R2|) 1|R1||R2|, 1fm= 2|R2| 1feq= 2 [ 2(|R1|+|R2|)- 1|R2| ] 1|R1||R2|

[figure]

Real inverted image at the object's own place: object at the centre of curvature, u=2feq

u= 1|R1| |R2| 2 (|R1|+|R2| )- 1|R2|

Answer: (4)

Keep practising — Ray Optics and Optical Instruments

Ques. 2JEE Main 2025, 23 January (Evening Shift)

A concave mirror of focal length f in air is dipped in a liquid of refractive index . Its focal length in the liquid will be:

  1. f
  2. f
  3. f
  4. f( -1)
Ques. 3JEE Main 2025, 23 January (Evening Shift)

The refractive index of the material of a glass prism is 3. The angle of minimum deviation is equal to the angle of the prism. What is the angle of the prism?

  1. 60
  2. 50
  3. 58
  4. 48
Ques. 4JEE Main 2025, 22 January (Morning Shift)

In the diagram given below, there are three lenses formed. Considering negligible thickness of each of them as compared to |R1| and |R2|, i.e., the radii of curvature for upper and lower surfaces of the glass lens, the power of the combination is [figure]

  1. - 16 ( 1|R1|- 1|R2| )
  2. - 16 ( 1|R1|+ 1|R2| )
  3. 16 ( 1|R1|+ 1|R2| )
  4. 16 ( 1|R1|- 1|R2| )
Ques. 5JEE Main 2025, 22 January (Morning Shift)

Given is a thin convex lens of glass (refractive index ) 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. R/
  2. R/(2 -1)
  3. R/(2 -3)
Ques. 6JEE Main 2025, 22 January (Morning Shift)

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 m. Another car approaches him from behind with a uniform speed of 90 km/hr. When the car is at a distance of 24 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 m/s2.

Ques. 7JEE Main 2025, 22 January (Evening Shift)

A symmetric thin biconvex lens is cut into four equal parts by two planes AB and CD as shown in figure. If the power of original lens is 4D then the power of a part of the divided lens is [figure]

  1. 2D
  2. 8D
  3. 4D
  4. D

All Ray Optics and Optical Instruments PYQs →

PDFDownload Ray Optics and Optical Instruments PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All JEE Main Physics chapters
Class 11Units and MeasurementsMotion in a Straight LineMotion in a PlaneLaws of MotionWork, Energy and PowerSystem of Particles and Rotational MotionGravitationMechanical Properties of SolidsMechanical Properties of FluidsThermal Properties of MatterThermodynamics (Physics)Kinetic TheoryOscillationsWaves
Class 12Electric Charges and FieldsElectrostatic Potential and CapacitanceCurrent ElectricityMoving Charges and MagnetismMagnetism and MatterElectromagnetic InductionAlternating CurrentElectromagnetic WavesRay Optics and Optical InstrumentsWave OpticsDual Nature of Radiation and MatterAtomsNucleiSemiconductor ElectronicsExperimental Skills (Physics)