Ray Optics PYQs Set 1 (PDF)

Set 1 of 18 · Questions 1-30 of 521

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Mere Teacher · Previous Year Questions JEE Main Physics · Ray Optics · Set 1 (Q1-30)
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1. $A combination of two thin lenses in contact have power + 10 D . The power reduces to + 6 D when the lenses are 0.25 m apart. The power of individual lens is$ (1) $5 D, 5 D$ (2) $6 D, 4 D$ (3) $7 D, 3 D$ (4) $8 D, 2 D$ 2. $The twinkling effect of star light is due to$ (1) $total internal reflection$ (2) $high dense matter of star$ (3) $constant burning of hydrogen in the star$ (4) $the fluctuating apparent position of the star being slightly different from the actual position of the star.$ 3. $Which of these is not due to total internal reflection?$ (1) $working of optical fibre$ (2) $difference between apparent and real depth of pond$ (3) $mirage on hot summer days$ (4) $brillance of diamond$ 4. $What is the relative decrease in focal length of a lens for an increase in optical power by 0.1 D from 2.5D? ['D' stands for dioptre]$ (1) $0.01$ (2) $0.04$ (3) $0.40$ (4) $0.1$ 5. $The exit surface of a prism with refractive index is coated with a material having refractive index . When this prism is set for minimum angle of deviation, it exactly meets the condition of critical angle. The prism angle is$ (1) $30^{\circ}$ (2) $15^{\circ}$ (3) $45^{\circ}$ (4) $60^{\circ}$ 6. $A person wears glasses of power - 2.0 D. The defect of the eye and the far point of the person without the glasses will be$ (1) $Nearsighted, 50 cm$ (2) $Farsighted, 50 cm$ (3) $Nearsighted, 250 cm$ (4) $Astigmatism, 50 cm$ 7. $To remove myopia (short sightedness) a lens of power 0.66 D is required. The distant point of the eye is approximately$ (1) $100 cm$ (2) $150 cm$ (3) $50 cm$ (4) $25 cm$ 8. $The time required for the light to pass through a glass slab (refractive index ) of thickness is ( , speed of light in free space)$ (1) $10^{- 11} sec$ (2) $2\times 1 0^{- 11} sec$ (3) $2 \times 10^{+ 11} sec$ (4) $2 \times 10^{- 5} sec$ 9. $Consider light travelling from a medium A to medium B separated by a plane interface. If the light undergoes total internal reflection during its travel from medium A to B and the speed of light in media A and B are 2.4 \times 10^{8} m / s and 2.7 \times 10^{8} m / s, respectively, then the value of critical angle is :$ (1) $cos^{- 1} (\frac{8}{9})$ (2) $sin^{- 1} (\frac{9}{8})$ (3) $cot^{- 1} (\frac{3}{13})$ (4) $tan^{- 1} (\frac{8}{17})$ 10. $For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distance between the retina and the cornea - eye lens can be estimated to be :$ (1) $2.5 cm$ (2) $1.67 cm$ (3) $1.5 cm$ (4) $5 cm$ 11. $If the critical angle for total internal reflection from a medium to vacuum is 45^{\circ}, then velocity of light in the medium is [NEET 2020]$ (1) $1.5 \times 10^{8} m / s$ (2) $\frac{3}{2} \times 10^{8} m / s$ (3) $2 \times 10^{8} m / s$ (4) $3 \times 10^{8} m / s$ 12. $If and are the permittivity and permeability of free space and and are the corresponding quantities for a medium, then refractive index of the medium is$ (1) $\frac{μ ϵ}{μ _{0} ϵ _{0}}$ (2) $insufficient information$ (3) $\frac{μ _{0} ϵ _{0}}{μ ϵ}$ (4) $1$ 13. $Which of the phenomenon is not common to sound and light waves ?.$ (1) $Interference$ (2) $Diffraction$ (3) $Coherence$ (4) $Polarization$ 14. $In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896 A ˚ and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.2 0^{o} To increase the fringe angular width to 0.2 1^{0} (with same λ and D) the separation between the slits needs to be changed to$ (1) $1.8 mm$ (2) $1.9 mm$ (3) $2.1 mm$ (4) $1.7 mm.$ 15. $Focal length of a convex lens is 20 cm and its RI is 1.5 . It produces an erect, enlarged image if the distance of the object from the lens is$ (1) $40 cm$ (2) $30 cm$ (3) $15 cm$ (4) $20 cm$ 16. $Image is formed for the short sighted person at$ (1) $Retina$ (2) $Before retina$ (3) $Behind the retina$ (4) $Image is not formed at all$ 17. $A ray of light is incident at from a medium of refractive index 2 into a medium of refractive index 1 , then the angle of refraction is$ (1) $30^{\circ}$ (2) $60^{\circ}$ (3) $45^{\circ}$ (4) $90^{\circ}$ 18. $Five persons P_{1}, P_{2}, P_{3}, P_{4} and P_{5} recorded object distance (u) and image distance (v) using same convex lens having power +5 D as (25, 96), (30, 62), (35, 37), (45, 35) and (50, 32) respectively. Identify correct statement$ (1) $Readings recorded by P_{3} and P_{2} persons are incorrect$ (2) $Readings recorded by P_{4} and P_{5} persons are incorrect$ (3) $Readings recorded by all persons are correct$ (4) $Readings recorded by P_{3} person are incorrect$ 19. $A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination oflenses. The power in diopters of the combination is$ (1) $zero$ (2) $25$ (3) $50$ (4) $infinite.$ 20. $The wavelength of light, while it is passing through water is 540 nm . The refractive index of water is . The wavelength of the same light when it is passing through a transparent medium having refractive index of is nm .$ (1) $540$ (2) $480$ (3) $840$ (4) $380$ 21. $For a transparent prism, if the angle of minimum deviation is equal to its refracting angle, the refractive index of the prism satisfies.$ (1) $1 < n < 2$ (2) $2 < n < 22$ (3) $2 < n < 2$ (4) $n ⩾ 2$ 22. $Critical angle of incidence for a pair of optical media is . The refractive indices of first and second media are in the ratio:$ (1) $1 : 2$ (2) $2 : 1$ (3) $2 : 1$ (4) $1 : 2$ 23. $A biconvex lens has radii of curvature, 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is [NEET 2022]$ (1) $+20 D$ (2) $+ 5D$ (3) $infinity$ (4) $+2 D$ 24. $The angle made by incident ray of light with the reflecting surface is called$ (1) $glancing angle$ (2) $angle of incidence$ (3) $angle of deviation$ (4) $angle of refraction$ 25. $Two convex lenses of focal length 20 cm each are placed coaxially with a separation of 60 cm between them. The image of the distant object formed by the combination is at_____cm from the first lens.$ 26. $When an object is kept at a distance of 30 cm from a concave mirror, the image is formed at a distance of 10 cm from the mirror. If the object is moved with a speed of 9 cms^{- 1} the speed (in cms^{- 1}) with which image moves at that instant is$ 27. $The image of an object placed in air formed by a convex refracting surface is at a distance of behind thesurface. The image is real and is at of the distance of the object from the surface .The wavelength of lightinside thesurface is times the wavelength in air. Theradius of the curved surface is . the value of is$ 28. $A convex lens of refractive index 1.5 and focal length is immersed in water. The difference in focal lengths of the given lens when it is in water and in air is . The value of is . (refractive index of water )$ 29. $A ray of light suffers minimum deviation when incident on a prism having angle of the prism equal to . The refractive index of the prism material is . The angle of incidence (in degrees) is ________.$ 30. $A deviation of is produced in the yellow ray when prism of crown and flint glass are achromaticallycombined. Taking dispersive powers of crown and flint glass are and respectively and refractiveindex for yellow light for these glasses are and respectively. The refracting angles for crown glassprism will be (in degree)(Round off to the Nearest Integer)$