Back to Ray Optics

Set 10 of 18 · Questions 271-300 of 521

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher

Mere Teacher · Previous Year Questions

JEE Main Physics · Ray Optics · Set 10 (Q271-300)

QR code to mereteacher.com

Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.

  1. 271.
    A beam of light both reflects and refracts at the surface between air and glass. The index of refraction of the glass is 1.4. If the refracted and the reflected rays are perpendicular to each other, then the angle of incidence in the air is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  2. 272.
    A light ray incidents normally on one surface of an equilateral prism. The angle of deviation of the light ray is (refractive index of the material of the prism )
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  3. 273.
    A point like object is placed at a distance of in front of a convex lens of focal length . A plane mirror is placed at a distance of behind the lens. The position and nature of the final image formed by the system is
    1. (1) from the mirror, real
    2. (2) from the mirror, real
    3. (3) from the mirror, virtual
    4. (4) from the mirror, virtual
  4. 274.
    For a plano convex lens has radius ofcurvature 10 cm. It is silvered on its plane surface. Find focal length after silvering.
    1. (1)10 cm
    2. (2)20 cm
    3. (3)15 cm
    4. (4)25 cm.
  5. 275.
    Find the value of the angle of emergence from the prism. Refractive index of the glass is . [NEET 2021]
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  6. 276.
    A point source of light is kept below the surface of water at a depth of . The radius of the circular bright patch of light noticed on the surface of water is ... .
    1. (1)
    2. (2)3
    3. (3)
    4. (4)
  7. 277.
    The refractive index of water is 1.33. What will be the speed oflight in water?.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  8. 278.
    Three rays of light, namely red , green and blue arc incident on the face of a right angled prism as shown in figure.

    The refractive indices of the material of the prism for red, green and blue wavelength are and
    respectively. The colour of the ray(s) emerging out of the face is:
    1. (1)green
    2. (2)red
    3. (3)blue and green
    4. (4)blue
  9. 279.
    If a ray of light in denser medium strikes a rarer medium at an angle of incidence , the angles of reflection and refraction are and respectively. If the reflected and refractive rays are at right angles to each other, the critical angle for the given pair of media is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  10. 280.
    A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is
    1. (1)10 cm
    2. (2)15 cm
    3. (3)2.5 cm
    4. (4)5 cm.
  11. 281.
    In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)? [NEET 2023]
    1. (1)-40 cm
    2. (2)-100 cm
    3. (3)-50 cm
    4. (4)40 cm
  12. 282.
    An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is
    1. (1)16
    2. (2)8
    3. (3)10
    4. (4)12
  13. 283.
    A concave lens and a convex lens are arranged as shown in the figure. The position of the final image.
    1. (1) to the left of convex lens
    2. (2) to the right of concave lens
    3. (3) to the right of concave lens
    4. (4) to the left of convex lens
  14. 284.
    The speed of light in media 'A' and 'B' are 2.0 x cm/s and 1.5 x chm/s respectively. A ray of light enters from the medium B to A at an incident angle ''. If the ray suffers total internal reflection, then
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  15. 285.
    A ray of light is incident normally on one face of a right angled isosceles prism. It then grazes the hypotenuse. The refractive index of the material of the prism is
    1. (1)1.33
    2. (2)1.414
    3. (3)1.5
    4. (4)1.732
  16. 286.
    Light enters from air into a given medium at an angle of with interface of the air-medium surface. After refraction, the light ray is deviated through an angle of from its original direction. The refractive index of the medium is
    1. (1)1.732
    2. (2)1.333
    3. (3)1.414
    4. (4)2.732
  17. 287.
    Three lenses of focal lengths and are placed at distance of and , respectively from an object. The distance between the object and the image formed is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  18. 288.
    A plano-convex lens having radius of curvature of first surface 2 cm exhibits focal length of
    in air. Another plano-convex lens with first surface radius of curvature 3 cm has focal length of when it is immersed in a liquid of refractive index 1.2. If both the lenses are made of same glass of refractive index 1.5, the ratio of and will be
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  19. 289.
    An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is [NEET 2016]
    1. (1)8
    2. (2)10
    3. (3)12
    4. (4)16
  20. 290.
    A beam oflight from a source is incident normally on a plane mirror fixed at a certain distance from the source. The beam is reflected back as a spot on a scale placed just above the source . When the mirror is rotated through a small angle the spot of the light is found to move through a distance on the scale. The angle 6 is given by
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  21. 291.
    Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the center. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is
    1. (1)-20 cm
    2. (2)-25 cm
    3. (3)-50 cm
    4. (4)50 cm
  22. 292.
    A transparent film of refractive index, 2.0 is coated on a glass slab of refractive index, 1.45.
    What is the minimum thickness of transparent film to be coated for the maximum transmission of Green light of wavelength 550 nm. [Assume that the light is incident nearly perpendicular to the glass surface.]
    1. (1)137.5 nm
    2. (2)275 nm
    3. (3)94.8 nm
    4. (4)68.7 nm
  23. 293.
    A convex lens with lateral magnification 2 is used to image a point at the bottom of a tank. The image of the point is formed above the lens. Now a liquid is filled into the tank to a height of . It is found that the distance of the image of the same point is now 120 above the lens. Find the refractive index of the liquid.
    1. (1)1.31
    2. (2)1.33
    3. (3)1.36
    4. (4)1.39
  24. 294.
    As shown in the figure, a plane mirror is fixed at a height of 50 cm from the bottom of tank containing water . The height of water in the tank is 8 cm. A small bulb is placed at the bottom of the water tank. The distance of image of the bulb formed by mirror from the bottom of the tank is ______cm.
  25. 295.
    The refractive index of prism is and the ratio of the angle of minimum deviation to the angle of prism is one. The value of angle of prism is ______
  26. 296.
    A fish rising vertically upward with a uniform velocity of 8 m , observes that a bird is diving vertically downward towards the fish with the velocity of 12 m . If the refractive index of water is , then the actual velocity of the diving bird to pick the fish, will be__________m .
  27. 297.
    Light from a point source in air falls on a convex curved surface of radius and refractive index 1.5 . If the source is located at from the convex surface, the image will be formed at_____ from the object.
  28. 298.
    The distance between an object and a screen is . A lens can produce real image of the object on the screen for two different positions between the screen and the object. The distance between thesetwo positions is . If the power of the lens is close to where is an integer, the value of is______________
  29. 299.
    A prism of refractive index and another prism of refractive index are stuck together (as shown in the figure). and depend on , the wavelength of light, according to the relation
    and
    The wavelength for which rays incident at any angle on the interface BC pass through without bending at that interface will be ___ nm
  30. 300.
    Two vertical parallel mirrors A and B are separated by 10 cm. A point object O is placed at a distance of 2 cm from mirror A. The distance of the second nearest image behind mirror A from the mirror A is ________cm.