JEE PHYSICS UNIT 16
QUIZ NO 2
TOTAL QUESTIONS = 20


1. A convex lens is placed in contact with a plane mirror. An object is placed on the principal axis at a distance of 20 cm from the lens. The focal length of the lens is 10 cm. The distance between the object and its image is:


2. In Young's double-slit experiment, the fringe width is 0.4 mm. If the wavelength of light used is doubled and the distance between the slits is halved, the new fringe width will be:


3. A beam of light of wavelength 600 nm from a distant source falls on a single slit 1.00 mm wide and the resulting diffraction pattern is observed on a screen 2 meters away. The distance between the first dark fringes on either side of the central bright fringe is:


4. A thin lens has a focal length f in air. Its focal length in a medium of refractive index 2 will be:


5. The resolving power of a telescope depends on:


6. In a diffraction pattern due to a single slit of width 'a', the first minimum is observed at an angle θ when light of wavelength λ is incident on the slit. The condition for the first minimum is:


7. A convex lens of focal length 20 cm is placed coaxially in contact with a concave lens of focal length 30 cm. The power of the combination is:


8. In Young's double-slit experiment, the separation between the slits is halved and the distance between the slits and the screen is doubled. The fringe width will:


9. A ray of light passes from air into a medium with a refractive index of 1.5. The angle of incidence is 30°. The angle of refraction is:


10. The critical angle for total internal reflection at a glass-water interface (n_glass = 1.5, n_water = 1.33) is:


11. A convex mirror has a focal length of 15 cm. An object is placed 10 cm in front of the mirror. The position of the image is:


12. In a compound microscope, the objective and eyepiece have focal lengths of 1 cm and 5 cm, respectively. The distance between the lenses is 20 cm. The magnifying power of the microscope is:


13. A beam of unpolarized light passes through a polarizer and then an analyzer. The angle between the transmission axes of the polarizer and analyzer is 60°. The intensity of the emerging light is:


14. Two coherent light sources produce interference fringes on a screen. If the intensity ratio of the maxima to minima is 9:1, the ratio of the amplitudes of the two sources is:


15. A plano-convex lens has a focal length of 50 cm. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface is:


16. In a double-slit experiment, the path difference between the two interfering waves at a point on the screen is λ/4. The intensity at this point is I. The maximum intensity is I₀. The ratio I/I₀ is:


17. A concave mirror forms an image of the same size as the object. The object is placed:


18. The angular width of the central maximum in a single-slit diffraction pattern is 0.2 radians. The slit width is 1 mm. The wavelength of light used is:


19. A lens has a power of +2.5 D. The focal length of the lens is:


20. In a Young's double-slit experiment, the visibility of fringes is 0.6. The ratio of the intensities of the two interfering beams is:



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